tremendous effort 九牛二虎之力

“九牛二虎之力”，字面意思是九头牛与两只虎的力气的相加（strength of nine bulls and two tigers），比喻其力大不可挡。常用于形容很费力才做成一件事。可以翻译为“ tremendous effort；all one's strength”。

例句：

我使出九牛二虎之力也没把它拽动。

I heaved with all my might but still couldn't budge it.

他费尽九牛二虎之力把那棵树重新立了起来，并一直照顾它，直到它完全复原。

He used all his strength to raise the tree back up again, and looked after it until it completely recovered.