Piperidine
n. [化]哌啶,氮杂环己烷
🗣️ 情景例句
Shopping vouchers are ofter a good means of attracting customers.
购物优惠券是吸引顾客的好方式。
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？
First I heard a noise.
我最先听见一阵响声。