The spirit is willing but the flesh is weak.

心有余而力不足。

They don't always have the capacity and they are figures of authority.

有的会心有余而力不足，但他们的确是一种权威的象征。

During the pandemic, nurses have worked non-stop and are still stretched thin.

在新冠肺炎期间，护士连轴转工作， 仍然是心有余而力不足。

She's too much for me in bed.

我心有余而力不足… 在床上。

I wish we could help you, but we just can't.

我们很希望能帮您 但心有余而力不足。

So this is for all the mothers who sat down with their children and explained all about making babies, and for all the mothers who wanted to but just couldn’t.

因此，这是写给所有的母亲，她们抱着孩子坐下，解释说养孩子的不易；这也是写给那些心有余而力不足的母亲们。