自从实验室建成后,他们已进行了一系列的实验英语怎么说
问题描述：
自从实验室建成后,他们已进行了一系列的实验英语怎么说
答
They have made a series of experiments after the laboratory has been built
自从实验室建成后,他们已进行了一系列的实验英语怎么说
They have made a series of experiments after the laboratory has been built