Arey's rule
[醫] 艾里氏規律(胎形胎齡規律)
?? 詞語組成解析
rule
[ru:l]
n. 規則，規定;統治，支配;章程;
vt.& vi. 控制，支配;判定;裁定，裁決;價格穩定;
vt. 統治;規定;管理;裁決;
vi. 統治;管轄;裁定;
??? 情景例句
using as many letters as possible.
盡可能多用字母，
Beauty, unaccompanied by virtue, is as a flower without perfume.
美而無德猶如花之無香。
How would you go to Beijing, by air or by train?
你怎樣去北京，是乘飛機還是坐火車？