Packed bed
[化] 填充层
🧩 词语组成解析
packed
[pækt]
adj. 充满…的;塞满了…的;
v. 包装(pack的过去式和过去分词);
bed
[bɛd]
n. 床;苗圃;河床;（地下由黏土、岩石等构成的）地层;
vt. 把…固定在;（某人）发生性关系;给人铺床;
vi. 上床;分层;
🗣️ 情景例句
Stocks, shares and bonds are good alternatives for personal investment.
储蓄、股票和债券是个人投资很好的选择。
Yesterday it rained all day.
昨天整天下雨了。
Not until last week did I get a work permit.
直到上周我才拿到工作许可证。