乃是

乃是

"乃是" means "is precisely" or "it is."

Here, '乃是' emphasizes a factual or declarative statement, adding weight to the preference of the subject.

这本书乃是我最喜欢的一本。

This book is my favorite one.

In this sentence, '乃是' reinforces the statement by indicating authenticity and accuracy.

他说的话乃是对事实的忠实描述。

What he said is a truthful description of the facts.

Here, '乃是' is used to connect a concept ('Success') with its explanatory condition ('the result of diligent work').

成功乃是勤奋工作的结果。

Success is the result of diligent work.