「能省則省」的英文該怎麼說？

a penny saved is a penny earned　　省一分錢，賺一分錢；能省則省

「五十步笑百步」的英文該怎麼說？

the pot calling the kettle black　

The world is your oyster.世界是你的牡蠣~?!

The world is your oyster.

有（如牛般的）決心與毅力的英文俚語

have the constitution of an ox

take with a grain of salt 意思是「拿起一把鹽」？關於「鹽」還有哪些有趣用法？

take (sth) with a grain of salt