effective例句
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。
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。
Women are sometimes seen to be less
effective as managers.
女性有时被认为不善于管理。