This is not a problem we should take lightly.

　　這個(gè)問題我們可不能掉以輕心。

　　They let us off lightly.

　　他們放過了我們。

　　These threats are not to be taken lightly.

　　這些威脅可不能等閑視之。

　　She tended to sleep lightly nowadays.

　　她如今睡覺容易驚醒。

　　It began to snow lightly.

　　開始下小雪了。