来自effect, 效果。

1. Condoms are an effective method of birth control if used with care.

如果使用得当，避孕套是很有效的避孕手段。

2. Light colours provide an effective backdrop for pictures or a mirror.

浅色是挂放图画或镜子很有效果的衬托。

3. Women are sometimes seen to be less effective as managers.

女性有时被认为不善于管理。

4. The initial image projected was of a caring, effective president.

他最初表现出的是一个充满爱心、办事有效的总统形象。

5. The bank must be run in a cost-effective way.

银行的经营必须追求成本效益。