连用Can you repeat this experiment? 你能否把这项试验重做一遍？

5. attend 的意思是"照顾(take care of, look after)；护理；出席；参加;上(学)等。

She attended him in hospital.她在医院护理他。

Only a few friends attended their wedding.只有几个朋友参加他们的婚礼。

He attended college in 1999.他在1999年去上大学。

attend on/upon侍候；随行 She is attending upon the patient. 他在侍候病人。

attend to致力于；专心于；处理；照顾Attend to work and stop talking.专心工作，不要说话。

6. ease用作动词，意思是"减轻；消除；舒缓；放松"，表示消除某人的痛苦时用结构"ease sb. of sth."；也可以用作名词，意为"舒适；自在；不拘束；容易"。

These pills will ease the headache. 这些药丸会减轻头疼。

Walking helped to ease him of his pain. 他散了散步减轻了一些痛苦。

Her words gave ease to my distracted mind. 我心神不宁，她的话使我宽心。

ease作名词时的常见搭配：

at ease放松；自如；不拘束 be/feel at ease感到舒适 ill at ease不自在；感到拘束 put/set sb. at one's ease使某人感到舒适、不拘束 with ease容易地；无困难地

7. exposed to cholera 是过去分词短语作后置定语，修饰people。相当于定语从句which were exposed to cholera。

expose的意思是"暴露；揭露；使曝光"，常与介词to连用，表示"使暴露于（日光、风雨等）；受到风险；使面临"的意思。

The soil was washed away by the flood, exposing bare rock. 泥土被洪水冲走，露出光秃秃的石头。

The baby was left exposed to the wind and rain.婴儿被弃于风雨之中。

The soldiers in the open field are exposed to the enemy's fire. 空地里的士兵暴露于敌人的火力之下。