In fact a very low level of real hydrocarbons is found outside the injection site.

实际上在注射处外部会发现有一种标准低的碳氢化合物。

youdao

In fact a very low level of real hydrocarbons is found outside the injection site.

实际上在注射处外部会发现有一种标准低的碳氢化合物。

youdao