dummy

别像个呆子一样站在那里，快来帮忙！

Stop standing there like a ___dummy and come help!

急救课上我们用人偶模型来练习心肺复苏术。

We practiced CPR on a ___dummy during the first aid class.

别像个傻子一样，这么简单的问题都答错。

Don't be such a ___dummy to get such an easy question wrong.