small vial of scent (anything with a citrus note is nice)

一小瓶香水（带清新橘子味的东西都很可爱）

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Its pen-like vial that is easy and convenient to carry and use.

它的笔形设计简单，方便携带，容易使用。

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First you have to evacuate the glass vial. Then you fill it with biogas.

首先必须将玻璃瓶的空气排空，然后充满沼气。

youdao

First you have to evacuate the glass vial. Then you fill it with biogas.

首先必须将玻璃瓶的空气排空，然后充满沼气。

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