New words：

effect [ɪˈfekt] n. 影响；作用；效果；效应
effective [i'fektiv] adj. 有效的；生效的；实际的

Sample Sentences：

The drug has some bad side effects.
I can certainly feel the effects of too many late nights.

Window screens are effective in keeping out mosquitoes.
Their efforts to improve the production have been very effective.

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