life is half spent before we know what it is.
人過半生，方知天命。
life is not all roses.
人生并不是康莊大道。
life without a friend is death.
沒有朋友，雖生猶死。
like a rat in a hole.
甕中之鱉。
like author， like book.
文如其人。
like father， like son.
有其父必有其子。
like for like.
一報還一報。
like knows like.
惺惺相惜。
like mother， like daughter.
有其母必有其女。
like teacher， like pupil.
什么樣的老師教什么樣的學生。
like tree， like fruit.
羊毛出在羊身上。