181、have a class 上课
The students are having a class now. 学生们目前正在上课。
We have a class every Tuesday afternoon. 大家每周二下午都有一节课。
182、in / after class 课上 / 课下
They usually discuss homework in class. 他们一般在课堂上讨论家庭作业。
After class, we often go to the playground to play. 课后，大家常常去操场玩。
183、clean up 把…… 打扫干净
Please clean up your room. It's a mess. 请把你的房间打扫干净。太乱了。
We cleaned up the park after the picnic. 野餐后大家打扫了公园。
184、clear up 天气 转晴;清理
The weather cleared up in the afternoon. 下午天气转晴了。
They cleared up the mess in the kitchen. 他们清理了厨房里的杂物。
185、close down 关闭;停业
The restaurant closed down due to poor business. 因为业务不好，餐厅停业了。
The government decided to close down the polluting factory. 政府决定关闭那家污染的工厂。
186、be close to 挨近……
The park is close to my house. 公园离我家非常近。
The school is close to the library. 学校离图书馆非常近。
187、be close to doing sth 几乎就要做某事
She was close to crying when she heard the news. 她听到这个消息时几乎要哭了。
He was close to finishing his project, but then he got sick. 他几乎要完成他的项目了，但他病了。
188、come to do sth 来做某事
She came to see me yesterday. 她昨天来看我了。
They came to help us with the project. 他们来帮助大家完成这个项目。
189、come across 偶然遇见;碰见
I came across an old friend in the shopping mall. 我在购物中心偶然遇见了一个老友。
While traveling, we often come across interesting places. 在旅游中，大家常常遇见有趣的地方。
190、come along 跟着来;出现
Come along, we're going to the zoo. 一块儿吧，大家要去动物园。
Don't worry, help will come along soon. 别担忧，帮助非常快就会到来。
191、come back 回来
When will you come back from your trip? 你什么时间从旅游中回来?
He promised to come back before midnight. 他承诺会在午夜前回来。
192、come by 顺路拜访
Feel free to come by anytime. 随时欢迎顺路拜访。
I'll come by your house after work. 我下班后顺路去你家。
193、come down 下来;降低
Can you come down from the ladder? It's unsafe. 你能从梯子上下来吗?如此非常不安全。
The temperature has come down slightly today. 今天气温有所降低。
194、come from 出生于;来自;产自
She comes from a small town in France. 她来自法国的一个小镇。
This wine comes from the best vineyards in the region. 这种葡萄酒产自该区域最好的葡萄园。
195、come in 进去
Come in, please. The door is open. 请进，门是开着的。
The guests are coming in now. Please take your seats. 客人目前进去了，请入座。
