Money doesn't grow on trees.

钱不是树上长出来的。

Necessity¹ is the mother of invention.

需要是发明之母。

No man is an island.

没有人是孤岛。

No news is good news.

没有消息就是好消息。

No pain, no gain.

不劳无获。

Once bitten, twice shy.

一朝被蛇咬，十年怕井绳。

One man's trash is another man's treasure.

一个人的垃圾是另一个人的宝藏。

Out of sight, out of mind.

眼不见，心不烦。

Penny wise, pound foolish.

小事聪明，大事糊涂。

Practice makes perfect.

熟能生巧。

Rome wasn't built in a day.

罗马不是一天建成的。

Seeing is believing.

眼见为实。

Silence is golden.

沉默是金。