这个计划本身并不违法，但会导致一些可疑的做法。

The plan wasn't illegal ___in ___itself but it would lead to some doubtful practices.

首先，在我看来，汽车本身不可能有害。

To begin with, a car, in my opinion, can't be harmful ___in ___itself.

这个提议本身是合理的，但可能面临实际挑战。

The proposal is reasonable ___in ___itself, yet it may face practical challenges.