“slacken off”造句，怎麼用slacken off造句

The demand for coal begins to slacken off in the spring.

Redouble your efforts and not slacken off.

Business in the small village usually slacken off during severe winters.

We've been really busy, but things are starting to slacken off now.

He had worked without intermission for six months and now could slacken off for a holiday.

You shouldn't slacken off in your study.