例: This afternoon we are going to listen to a report on the international situation.
今天下午我们要听关于国际形势的报告。
Professor Shen will give us a talk on traveling in America.
申教授将给我们做关于美国之行的报告。
You are wrong on all these issues. 在这些问题上你的看法都错了。
The belief is based on practical experience. 这种信念是以实际经验为基础的。
Theory must be based on practice. 理论必须以实践为基础。
The people in the south live on rice. 南方人主食大米。（靠）
The citizens live on their salaries. 城市人靠薪金生活 。
You can"t afford luxuries, on an income of 100 yuan a month．
靠月薪100 元的收入，你是买不起奢侈品的。
Her pet dogs were fed on the choicest food． 她用精饲料喂养她心爱的狗。
He is just a scrounger, who lives on other people. 他正是一个小偷，专靠损害别人过日子。
Keep the kettle on the boil （=boiling）. 让水壶的水一直开着。
The enemy are on the run （=running）. 敌人在逃跑。
On 后接 the 加上一个作名词的动词．其意义与现在分词所表达的相近。类似例子很多如：
on the march 在行军中，on the mend 在好转中，on the prowl 徘徊，on the move 活动中，on the scrounge 巧取豪夺（俚语），on the go 活跃，忙碌，on the lookout 注意, 警戒，on the watch 监视着。on the hop 趁不备抓住某人等等。
on the People"s Democratic Dictatorship 实践论和矛盾论
on the People"s Democratic Dictatorship 论人民民主专政
on Coalition Government论联合政府
着、罢、出售、偷、公、假，故意、支付，相反、准
注：口诀中的着是指着火，罢指罢工，偷指偷偷地，公指出差、办公事；假指休假，准指准时。
例：The house next to mine was on fire. 我邻居的房子着火了。
The workers of the railway station were on strike. 铁路工人罢工了。
Grapes and big water melons from Sinkiang are on sale on a large sale.
新疆葡萄和西瓜大量上市了。
Do something on the sly （quiet）. 秘密地（暗地里，偷偷地）做某事。
I"ve come here on business. 我是有公事来的。
They went to Bern on a mission. 他们到伯尔尼去执行一项使命。
They have been away on a long trip. 他们出去做一次长途旅行。
I"ll go home on leave next month. 下月我将休假回家。
I went on business to Shanghai. I did not take leave. 我是公出去上海的，不是不告而别。
She came to see you on purpose. 她是专程来看你的。
He came here on purpose to discuss it with you. 他到这来是要与你讨论这件事的。
This lunch is on me.这顿午饭我付钱。
No. let"s go Dutch.不，还是各付各的。
On the contrary, it was very easy to understand. 相反，这事儿很容易理解。
P1ease come on time. （on schedule）. 请准时来。
注：in time 是及时的意思。
The train arrived on schedule. 火车准时到达。
特定时间和一就，左右 on 后动名词
例：Gases expand on heating and contract on cooling. 气体加热时膨胀，冷却时收缩。（特定时间）
On entering the room, he found his friends dancing in high spirits.
一进屋，他就发现他的朋友们在愉快地跳舞。
On reaching the city he called up Lao Yang. 一到城里他就给老杨打了一个电话。
I"ll write to him on hearing from you. 我接到你的来信就给他写信。（一就）
以及 on the left, right 向左向右，on the stair 在台阶上等。
步行、驴、马、玩笑 on，cab，carriage 用 in
例：On foot 步行; on horse 骑马; on donkey 骑驴。
He rode on, blood flowing from his side. 他骑着马，鲜血从腰部流下来。
The soldier of the Eighth Route Army rode 100 li on a horse a day in order to catch up with his unit. 为赶上部队，那位八路军战士骑马日行百里。
Go on horse back! 骑马去！
You are having me on! 你和我开玩笑呢!
in cab 和 in carriage 不能用 on 或 by cab 或 carriage。
at 山脚、门口在当前，速、温、日落价核心
即在山脚下、在门口、在目前，速度、以速率、温度、在日落时、在核心要用at。
例：At the foot of the mountain, there are thirty of our comrades.
在山脚下，有我们30 个同志。
There is a beautiful lake at the foot of the hill. 山脚下有一个美丽的湖。
At the gate of the house there are many children playing glass ball.
门口有一大群孩子在玩玻璃球。
Who"s standing there at the door? 谁站在门口?
I don"t need the dictionary at present. 我现在还不需要这本词典。
He is at present in Washington. 他目前正在华盛顿。
The train runs at fifty kilometres an hour. 火车每小时行驶50 公里。
We built the plant at top speed and minimum cost.
我们以最低的投资，最高的速度修建了该工厂。
at home 在国内，在家里
at ten degrees centigrade 在摄氏10 度
at minus ten degrees centigrade 摄氏零下10 度
Water freezes at 0centigrade. 水在摄氏零度结冰。
Water usually boils at 100. 水通常在摄氏100 度沸腾。
at zero 在零度
at the rate of 45 miles an hour
at full speed 全速
at a good price 高价
at a low cost 低成本
at a great cost 花了很大代价
at that time 在当时
Evaporation takes place at all temperatures. 蒸发在任何温度下都能发生。
at 1000 RPM （revolution per minute） 每分钟1000 转
at a high speed 高速
The soldiers launched an attack upon the enemy at sunset.
战士们在日落时对敌人发起了攻击。
at daybreak 日出时
The force at the core leading our cause forward is the Chinese Communist Party.
领导我们事业的核心力量是中国共产党。
The atom has a nucleus at its core. 在原子的中心有一个原子核。
At the beginning of this term the teacher in charge of our class was very strict with us. 这学期开始，我们的班主任老师对我们要求非常严格。
以及 At the first session of the First National People"s congress of the People"s Republic of China. 在中华人民共和国第一次全国人民代表大会第一次会议上.
常用的 at 短语有:
at first 首先，开始时
at least 至少
at all events 无论如何
at home 在家，无拘束
at one stroke 一下子
at a loss 不知怎办
at any rate 不管怎样
at length 详细地
be at high tide 处于高潮期
at our invitation 应我们的邀请
at our request 应我们的请求
at the news 听到这消息
at the risk of 冒危险
at a great expense 以巨大费用
at a stroke 一举
at intervals of 每隔
at liberty 有权，随意
at the sight of 一见到
at the point of 接近，靠近
at the thought of 一想到
at the speed of 以速度
at the cost （price） of 以为代价
at leisure 闲着、失业
at the disposal of 任凭使用
at stake 在危险中、在成败关头
at bottom 实际上、本质上
at short notice 一得到通知
at seeing us 看到我们
at the happy tidings 听到喜讯
at sixteen 在16岁时
at the present stage 在现阶段
at the weekend 周末
at all times 永远
at 405 Victory Road 在胜利路405号
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