A fox may grow gray, but never good.

狐狸可以变老，但本性难移。

A friend in need is a friend indeed.

患难见真情。

A friend is easier lost than found.

得朋友难，失朋友易。

A friend is never known till a man has need.

一个人在需要帮助时才知道谁是真正的朋友。

Many flowers grow in clusters.

许多花成簇生长。

Many kinds of cactus grow on the desert.

沙漠里生长着许多种仙人掌。

Day by day he seems to grow taller.

他看起来一天比一天高。

这些谚语都以不同的方式表达了“grow”的概念，从自然界的生长现象到人际关系中的成长与变化。希望这些例子对你有所帮助。