1.signal sth. for sb. 表明
That was a sharp signal for me that I'd better start improving my fitness immediately if I don't want to fall ill again.
這對于我來說是一個緊急信號：如果不想再病倒，我就必須立刻開始提高自己的身體素質Jf.=m;c*|^&FoW。

2.on behalf of 以……的名義
Isaac prayed to the Lord on behalf of his wife, because she was barren.
以撒因他妻子不生育，就以她的名義祈求耶和華9Fa;yM+!r5i%02vIKKHG。

3.raise alarms 敲響警鐘
Google's border-straddling scale and its brash ambitions raise alarms with some European politicians.
谷歌的跨國經營規模和它的雄心壯志給歐洲政治家們敲響了警鐘FSVBEH;@j+]Y4(dQ@=;。

4.be contingent on 取決于
Who should care for the elderly and how pension systems should be funded are often contingent on cultural norms and preferences.
誰來照顧老年人，應該怎樣資助養老金體制兩個問題往往取決于文化標準和文化取向e!=fcE~X3mKH=m.z#|i。