by chance
同义词：
once | circumstantially | by luck | unexpectedly | haply | perchance | accidentally |
反义词：
词义辨析：
同义参见:
once
反义:
偶然地; 意外地
by design
on purpose
by chance
同义词：
once | circumstantially | by luck | unexpectedly | haply | perchance | accidentally |
反义词：
词义辨析：
同义参见:
once
反义:
偶然地; 意外地
by design
on purpose