none of them should be used lightly 但任何一个都不应该像这样滥用

none of:当中谁都不, 当中没人

None of us can hope to strike twelve every time.

我们中间谁也不能指望回回获胜。

It was just a bit of fun 只是好玩嘛

a bit of:一点儿的

Setting up this business was a bit of a gamble.

开办这样的公司有点冒险。

The party was a bit of a damp squib.

这次聚会有些扫兴。

You will keep an eye on Frodo, won't you? 你会帮我好好看着佛罗多的，会吧?

keep an eye on:留意； 照看

Would you keep an eye on my baby for a while?

请你照看一下我的婴儿好吗?

He asked his neighbour to keep an eye on his house.

他请邻居照看他的房子。