Tetrahedrals
(tetrahedral 的復數) a. 有四面的, 四面體的
??? 情景例句
Robbie, maybe you should call them，
Robbie也許你應該給他們打個電話，
Please make sure that the goods be protected from moisture.
請保證貨物不受潮。
a wave length (the horizontal distance between two wave crests),
波長（兩個浪峰間的水平距離）