I happened to know about Jack.

我碰巧了解杰克的情况。

youdao

Mary was mistaken about Jack.

玛丽错看了杰克。

youdao

"Don't worry about Jack," she continued.

“不必担心杰克，”她继续说道。

youdao

What about Jack? We can't just leave him here.

杰克怎么办？我们不能就这样把他留在这儿。

youdao

Jack 's father and the professor are talking about Jack.

杰克的爸爸正在和教授谈论杰克。

youdao

Jack 's father and the professor are talking about Jack.

杰克的爸爸正在和教授谈论杰克。

youdao