strength通常指體力或人、事物等擁有的實力。

　　例句：

　　1、His energy was unbounded and his patience inexhaustible.

　　他有無窮的精力和無限的`耐心。

　　2、Plants produce sugars and starch to provide themselves with energy.

　　植物產(chǎn)生糖和淀粉來為自身提供能量。

　　3、Her decision to continue shows great strength of will.

　　她決心堅持下去，顯示出了很大的意志力。