常见例句Then, with a Bunsen burner, the surface is thoroughly seared.然后，用本生灯彻底烧灼表面。First, open the clamp or valve so that biogas can flow back from the balloon to the Bunsen burner.首先，打开钳或阀，使沼气可以回流从气球的本生灯。 返回 Bunsen burner