Estergum
松酯胶, 酯树胶
🗣️ 情景例句
I called my parents from the airport.
我从机场打电话给我父母。
An oak is not felled at one stroke.
万事不能一蹴而就。
And if, with the decay of vitality, weariness increases,
再者，随着精力的衰退，老年人的疲惫感会增长，