Dbd
[化] 二溴卫矛醇
🗣️ 情景例句
you'll help me select some of the great places.
能帮我挑一些好地方。
It falls on the last day of the lunar year and lasts until the Lantern Festival.
克节从阴历年的最后一天开始一直持续到元宵节。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
这种通讯联系要靠21厘米波段，即每秒1420兆周的精确无线电频率。