Olefination
烯化作用, 成烯作用
🗣️ 情景例句
OK.
好的。
Repetition is the mother of knowledge.
反覆学习是知识之源。
We are lucky in that only the lower fields, which make up a very small proportion of our farm, are effected by flooding,
值得庆幸的是，只有低洼的受到洪水影响，而低洼地在我们农场比例很小。