题目内容：

what all the inventionshave in common is that they have succeeded.
翻译以上句子.

优质解答

所有的发明的共同点是它们都成功了
what all the inventionshave in common在一起作为主语
由What引导.意为所有发明的共同点是
that they have succeeded 是表语从句
that引导 意为它们都成功了
整句话的意思是
所有的发明的共同点是它们都成功了.