但到那时，你已经老了，无法再做其他事。

But by that time, you're too old to do anything else anyway.

youdao

但到那时通用在美国市场的份额已跌至不足25%。

But by then GM's share of the American market had fallen to below a quarter.

youdao

独角鲸的再次出现则要到第二年的五月，但到那时海面上的冰块早已不知了去向。

The narwhal do not arrive until May, but by then the sea ice is long gone.

youdao