Ulf
n. 超低频
🗣️ 情景例句
on the telephone for me, please.
请替我拨电话。
I would like to cancel the reserved seat.
我要取消已预定的位置。
Historians have long been puzzled by dots, lines and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
长期以来，历史学家一直对雕刻在墙壁上、骨头上、古代长毛象的象牙上的点、线和形形色色的符号感到困惑不解。