Bed density
[化] 床層密度
?? 詞語(yǔ)組成解析
bed
[b?d]
n. 床;苗圃;河床;（地下由黏土、巖石等構(gòu)成的）地層;
vt. 把…固定在;（某人）發(fā)生性關(guān)系;給人鋪床;
vi. 上床;分層;
??? 情景例句
Richard, how much broccoli do I need for seven people? Richard
七個(gè)人吃需要多少花椰菜
Bet you can't catch me.
打賭你無(wú)法捉到我。
Please! said the man from downstairs.
“勞駕！”樓下人說(shuō)。