a cat has 9 lives. ----> 猫有九条命
a good beginning is half done. ----> 良好的开端是成功的一半
a good beginning makes a good ending. ----> 善始者善终
a good book is a good friend. ----> 好书如挚友
a good book is the best of friends, the same today and forever. ----> 一本好书,相伴一生
a good conscience is a soft pillow. ----> 不做亏心事,不怕鬼叫门
a good fame is better than a good face. ----> 美名胜过美貌
a good husband makes a good wife. ----> 夫善则妻贤
a good medicine tastes bitter. ----> 良药苦口
do as you would be done by. ----> 己所不欲,勿施于人
doing is better than saying. ----> 与其挂在嘴上,不如落实在行动上
do it now. ----> 机不可失,时不再来
do nothing by halves. ----> 凡事不可半途而废
don't claim to know what you don't know. ----> 不要不懂装懂
don't have too many irons in the fire. ----> 不要揽事过多
don't make a mountain out of a molehill. ----> 不要小题大做
don't put off till tomorrow what should be done today. ----> 今日事,今日毕
don't put the cart before the horse. ----> 不要本末倒置
don't trouble trouble until trouble troubles you. ----> 不要自找麻烦
don't try to teach your grandmother to suck eggs. ----> 不要班门弄斧
a friend in need is a friend indeed 患难见真情/患难朋友才是真朋友