?? 詞語組成解析
subclass
['s?b?klɑ:s]
n. 亞綱，子集;子類;
后哺乳下綱
??? 情景例句
Don't be too sure.
別那么肯定。
I got home, feeling very tired.
我到家時都累死了[分詞作狀語]
Do we have to wear the helmets?
我們得戴上防護帽嗎？