late 14c., "serving to effect the intended purpose," from Old French effectif, from Latin effectivus "productive, effective," from effect-, stem of efficere (see effect (n.)). Of military forces, meaning "fit for action or duty" is from 1680s.
实用例句
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。
来自柯林斯例句
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。
来自柯林斯例句
3. Women are sometimes seen to be less effective as managers.
女性有时被认为不善于管理。
来自柯林斯例句
4. The initial image projected was of a caring, effective president.
