对于正在备考托福的考生来说，词汇是特别重要的，不管是听力、写作、阅读还是口语，都关系着词汇。

Identify your problems, but give your power and energy to solutions.

识出你的问题，但把力量与精力放在解决办法。

bacteria  noun

[bækˈtɪriə]

(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission

细菌

例句：

Chlorine is added to kill bacteria.

加氯是为了杀死细菌。