Undecylamine
十一胺
🗣️ 情景例句
Without that, it's hard.
没有就难办了。
Which would you prefer, a smoking seat or a non-smoking seat?
你喜欢哪种，吸烟座还是禁烟座呢？
Porpoises and sharks are natural enemies.
海豚和鲨鱼是天然仇敌，