奏效的用英语怎么说？

奏效的

• effectual

例句

• This is the stuff that really makes seducing a woman work. 这真的是可以色诱奏效的方法.
• When that doesn't work they sometimes have the sense to seek help... 那种方法不奏效的时候，他们有时会想到要寻求帮助。
• Congress has a responsibility to ensure that all peaceful options are exhausted before resort to war. 国会有责任确保只有在所有和平手段都不奏效的情况下才会诉诸战争。