Vacuum envelope
[电] 真空套
🧩 词语组成解析
envelope
['envələʊp]
n. 信封，封皮;壳层，外壳;包裹物;[生物学]膜，包袋;
en 表示\"进入…之中，包围\" +velop =cover（盖上） +e → .信封, 封套, 封袋, [天]包层, [数]包迹, [生]包膜
🗣️ 情景例句
About three weeks. We'll have enough time for our talks.
大约三个礼拜，我们有足够的时间交谈了。
ON. It gets bright.
合上开关，它就会变亮。
Hay had been cut and cowsheds had been cleaned.
干草已切好，牛棚也打扫干净了。