這些都是我寫作的時(shí)候常用的．覺得不饒口也好記．
every coin has its two sides.
everything has its pros and cons.(這句比較口語一點(diǎn))
...is a two-edged sword.
...是把雙刃劍．
No garden without its weeds.
沒有無雜草的花園（有利有弊）
everything has double folds.
every medal has its reverse.
補(bǔ)充問題的回答:
推薦用這句:
It is essential to examine every angle in order to fully understand the nature of a perplexing problem.
為了全面了解一個(gè)復(fù)雜問題的本質(zhì),很有必要從各個(gè)方面對事件進(jìn)行調(diào)查．