sign-up的中文翻译是什么意思

He has posted a sign up that says "No Fishing"

他已经张贴了一张“禁止钓鱼”的告示牌。

They manage to sign up all the best performers.

他们设法跟所有最佳演员签订合同.

Can I sign up for this course in advance?

我能事先申请上这一课程 吗 ?

You don't sign up for life, you know.

你用不着参加一辈子的, 你知道罢?

When I'm old enough I'll sign up and go to the front and fight.

我长大了,一定报名入伍,到前线去打仗.