Permeation tube
[化] 渗透管
🧩 词语组成解析
permeation
[ˌpɜ:mɪ'eɪʃn]
n. 渗入，透过;
🗣️ 情景例句
I want to take a few days off just for relaxation.
我想请几天假放松放松。
When was the last time he wrote you ?
他给你写最后一次是什么时候？
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。