Turn on the gas and light the oven .

转动 煤气 开关点燃烤箱。

The principle turn on the carrier gas before power on and turn off carrier gas last shall be complied when using gas chromatograph .

气相色谱仪任何时候使用均需遵守先开载气、后开电；后 关载 气的原则。

Turn the flashlight on outside before entering because the battery may produce a spark that could ignite leaking gas if present .

进屋前就 要 打开电筒，因为如果屋内 煤气泄漏， 打开电筒可能会引起火花。

Turn on the carrier gas and establish the proper flow rate .

接通载 气，调至合适地流速。