Paramutualism
兼性互惠共生
??? 情景例句
I was laid off.
我下崗了。
You'd better go and see a doctor about that.
關(guān)于那個毛病，你最好去看醫(yī)生。
Historians have long been puzzled by dots, lines and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
長期以來，歷史學家一直對雕刻在墻壁上、骨頭上、古代長毛象的象牙上的點、線和形形色色的符號感到困惑不解。