- 释义：
- v. 是(be的第三人称单数现在时)
- 例句：
-
In conversational English " is not " often contracts to " isn't ".
口头英语中is not 常缩写为 isn ‘ t.
换一句
-
It is vitally important to cancel the order immediately.
马上取消这批订货是至关重要的.
换一句
-
It is necessary to set down these additional rules.
有必要制定这些补充规则.
换一句