Pterosterone
蝶甾烯酮, 六羟基胆甾烯酮
🗣️ 情景例句
Let me know by the end of the week.
这个周末前给我回音。
These shoes are worn-out.They've lasted a long time.
这些鞋子旧了。已经用了很长时间了。
Firemen had been fighting the forest for nearly three weeks before they could get it under control.
消防队员们同那场森林大火搏斗了将近3个星期才最后把火势控制住。