First, I take a beaker of water and heat it gently over a Bunsen burner.

首先，取一烧杯的水，在本生灯上微微加热。

youdao

First, I take a beaker of water and heat it gently over a Bunsen burner.

首先，取一烧杯的水，在本生灯上微微加热。

youdao