?? 詞語組成解析
subclass
['s?b?klɑ:s]
n. 亞綱，子集;子類;
軟甲亞綱
??? 情景例句
You are always straying from the subject.
你說話總愛跑題。
In books,are embalmed the greatest thoughts of all ages.
偉大思想古今有，載入書中成不朽。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到達油層，石油就會由于地下巨大的壓力流到地面上來，