trillion

兆、万亿

The national debt has now passed thirty trillion dollars.

国债现在已经超过三十兆美元。

无数、大量口语，常用复数

There were trillions of ants swarming over the fallen fruit.

成千上万的蚂蚁爬满了掉落的水果。

兆的、万亿的

They are aiming to build a trillion dollar company.

他们的目标是打造一家市值上兆美元的公司。