The structure of molecules can be seen under an electron microscope.分子的结构可在电子显微镜下观察到.An electron has a negative charge, a proton has a positive charge.电子带负电荷, 质子带正电荷.Freedom, gravity, ego, and electron are constructs.自由,...
Each mourner wore a black armband and a white paper chrysanthemum.每个吊唁的人都佩带着黑纱和一朵白纸菊花.The old man potted the chrysanthemum cuttings.老人把菊花的插枝种在花盆内.There are many species of chrysanthemum.菊花品种很多....