Since we are young, we should do more for our country.
既然我们年轻，我们应当多为国家做事。
— Why is Kate absent? 凯特为什么迟到了？
— Because she is ill. 因为她病了。
since的另外一种用法，是表示“自从……以来”。
Where have you been since I last saw you?
上次我和你见面以后，你到哪里去了？
It is a week since we arrived here.
我们到这里来已经有一个礼拜了。
（2）本句中cover的用法，意思是“用……遮盖；覆盖”。
Snow covered the ground.
雪覆盖了地面。
She cried and covered her face with her hands.
她哭了，用手蒙住了脸。
The desk was covered with dust.=Dust covered the desk.
书桌上布满了灰尘。
7． …, he encouraged everyone to take part in protec
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