We must buckle down ourselves until we complete the tower.

我们必须全力以赴直到我们完成了这座塔的兴建。

youdao

If you want to learn English you have to buckle down.

如果你想学英语，你就得非常努力。

youdao

If you want to learn English you have to buckle down.

如果你想学英语，你就得非常努力。

youdao