by itself

基本解釋

How did the door open by itself?
門怎么自己開了?
《新英漢大辭典》
Only then did he look down at the piece of paper and realize his hand was drawing patterns all by itself.
直到后來護士問他在畫什么，他才低頭看看那張紙，并且意識到完全是自己的手在自動畫圖。
Risk, by itself, will not threaten the success of a project if it is recognized and addressed in a timely fashion.
如果風險自身被公認為一種適時的方式的話，那么它將不會對項目的成功構成威脅。

But no C those surprised Russians thought that no one regiment by itself would come around there at such a time.
They live without nomoi and they wreck not of one another, that is to say,each family lives by itself.
獨眼怪沒有法律,如同一盤散沙,就是說,他們每個家庭都自給自足
耶魯公開課 - 古希臘歷史簡介課程節(jié)選
there're 4 million people living in Brooklyn by itself.
在布魯克林住著四百萬人口。
在布魯克林的生活 - SpeakingMax英語口語達人

The chief lesson of Afghanistan, for America, is that it can fight its wars by itself.
ECONOMIST: The war in Afghanistan