The city's streets are filthy and choked with exhaust fumes.那座城市的街道肮脏不堪，弥漫着令人窒息的废气。When your exhaust falls off, you have to replace it.如果你的排气管脱落，应将其更换。The problem was that the exhaust gases contain many toxins.问题在于废...
When your exhaust falls off, you have to replace it.如果你的排气管脱落，应将其更换。There are many sources of air pollution; exhaust fumes, for example.空气污染有许多来源, 例如废气。the exhaust fumes that are polluting our cities污染我们城市的废气Exhaust fume...
PC - 3 cells were transfected with mGM - CSF expressing plasmid or the control vector by lipo - some transfection.通过脂质体转染法,将含GM -CSF 基因的质粒及空质粒转染至PC -3 细胞.Conclusions 1 . The expression vector pS 2 - DTA contains the EWS ...