我理解这对你来说是个艰难的选择。

I ___appreciate that it's a tough choice for you.

我理解搬运那些古董家具相当具有挑战性。

I ___appreciate that moving the antique furniture was quite a challenge.

她完全理解国际谈判的复杂性。

She fully ___appreciates the complexity of the international negotiations.