详细解释:决不
词意辨析：
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。英语解释：
副词 by no means:
definitely not同义词：not by a long sight, not by a blame sight