Ecotone
n. [生]群落交错区
🗣️ 情景例句
Thanks, Mom.
谢谢，妈 。
The view was terrific.
景色美极了。
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。