She swung around to him, spilling her tea without noticing it.她一下子转身面向他，茶水溅了出来都没注意到。Andrew couldn't help noticing that she coloured slightly.安德鲁不禁注意到她有点脸红了。He passed into the house without my noticing him.我还没注意到他,他就...
She swung around to him, spilling her tea without noticing it.她一下子转身面向他，茶水溅了出来都没注意到。He passed into the house without my noticing him.我还没注意到他,他就进了这所房子.Andrew couldn't help noticing that she coloured slightly.安德鲁不禁注意到...
Hydrocarbons ( HC ), like carbon monoxide, represent unburned and wasted fuel.碳氢化合物 ( HC ) 像一氧化碳一样, 为未燃尽的和被浪费掉的燃料.With this restricted frequency range it is not applicable to hydrocarbons.这个较紧缩的频率范围不适用于烃类.These compounds...