Sepiapterin
[化] 墨蝶呤
🗣️ 情景例句
when I was about eighteen years old.
那时我差不多十八岁。
Once an opportunity slips away, it is gone for good.
机会一旦错过，永远不会再来。
But even when such refinements are not available, there is plenty to keep you occupied.
即使没有这些消遣条件，也总是有事可做。