vt.
加强；使强壮，使坚强有力；巩固：
We all agreed on a treaty to strengthen the cooperation between our two parties.
我们就双方的合作事宜签订了协议。
to strengthen one's courage
鼓舞某人，让某人鼓起勇气
加强…的艺术效果
【语音学】改变(或重读)…的发音
vi.
变强；变强壮；变牢固；加强，巩固：
You're too weak;you'd better strengthen with ri