Density of particle
[医] 微粒密度
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
Front Desk. Can I help you?
前台，需要我为您服务吗？
Don't forget to print airmail on the letter.
不要忘记在信封上印上航空邮件
We'd like a chance to bid on this business.
我们希望能有机会投标这笔生意。