by all means意思是当然可以;一定，务必;只管;百般
一、当然可以
1、If you can find a use for this old computer, by all means keep it.
如果你觉得这台旧电脑对你还有用的话，你当然可以留作己用。
2、By all means try the jacket on, but I think it will be too big for you.
当然可以试一下这件夹克衫，但我觉得你穿太大了。
二、务必
1、I told the waiter by all means to bring caviare and the cheapest dish on the menu.
我告诉服务员务必要拿来鱼子酱和菜单上最便宜的菜。
2、You must realize this plan by all means.
你务必完成这个计划。
扩展资料
同义词：
一、be sure to
英 [bi: ʃuə tu:] 美 [bi ʃʊr tu]
务必;必定;切;得
1、Be sure to come. Don't let me down.
你一定来，可别拆我的台。
2、Be sure to make this point clear to everyone.
务使大家明了这一点。
二、without fail
英 [wiˈðaut feil] 美 [wɪðˈaʊt fel]
必定，一定
Take the money to your office without fail, first thing in the morning
早上第一件事是一定要把钱拿到办公室去。
