Dipmeter
栅陷振荡器, 栅流陷落式测试振荡器
🗣️ 情景例句
but when I received the letter
但是当我收到那封信
Empty wagons rattle loudest.
空车响声大。
The seeds must be carefully chosen; they must fall on good ground;
那就必然从精选良种做起，然后将其植入肥沃的土地，