Legendre condition
[計] 勒讓德條件
?? 詞語組成解析
n. 勒讓德（法國數學家）
condition
[k?n'd???n]
n. 狀態;環境;健康狀況;條款;
vt. 制約;限制;使習慣于;使適應;
vt.& vi. 對…具有重要影響;影響（某事發生的方式）;保持（頭發或皮膚等的）健康;養護;
con共同+dit給予+ion抽象名詞→共同給出的東西 → 條件
??? 情景例句
Why don't you go to your room, Mom, and get some sleep.
為什么不到你的房間去？媽媽， 去睡一會兒。
It only takes a few minutes.
只要幾分鐘而已。
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏書使教育成為可能，而教育反過來又豐富了藏書，因為知識的增長遵循著一種“滾雪球”的規律。印刷術的發明又大大提高了知識增長的速度。