Pentamethylene oxide
[化] 氧己環
?? 詞語組成解析
n. [化]環戊烷
oxide
['ɑksa?d]
n. [化]氧化物;
??? 情景例句
How many people are there in your family?
你家里有幾口人？
Excuse me for a moment.
失陪一會兒。
In the pioneering days, however, this was not the case at all.
然而，在登山運動的初期，全然不是這種情況。