by all means

by all means, by no means

这两个词组都是by...means的形式。
by all means: 意思是“一定”、“无论如何”、“用一切手段”；by all means亦可用于回答，表示有礼貌的同意，作“好的”、“当然可以”解。

• you must bring him here by all means.
  你们一定要设法把他带到这里来。
• this project must be realized by all means.
  这个规划必须要实现。
• you should by all means warn him before he leaves for singapore.
  你务必在他去新加坡之前提醒他。
• may i have one？—yes，by all means.
  我可以拿一个吗？——当然可以。

by no means: 意思是“决不”，相当于not at all.

• she is by no means bright.
  她一点儿也不聪明。
• i will by no means consent.
  我决不同意。
• the first step will take quite a long time and can by no means be accomplished overnight.
  第一步的时间是相当地长，决不是一朝一夕所能完成的。

副词 by all means:

1. definitely or certainly

1. By all means, provided that it is a well- pay job.
   如果这是个薪俸优厚的工作，当然可以。
2. The prices are variable, shop around by all means.
   价格高低不一，所以一定要货比三家逐店选购。
3. We have to finish our task by all means.
   我们必须竭力完成任务。
4. 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。