堕落系列

Balmer series───巴耳末系；巴耳末光谱

alkene series───烯烃系

Taylor series───泰勒系列，泰勒级数

alkane series───烷烃系列

alkyne series───炔烃系列

fallen arches───足弓下陷

fallen behind───拖欠；落在后面

But foreign adoption has fallen from a peak in 2004 after a series of scandals over lax standards led to tighter rules in America.───到2004年达到了顶峰。 但由于监管不严，随之而来的一系列领养丑闻，迫使当局收紧了政策，给领养热降了温。 当然，更为严格的法令并不是唯一的原因。

of Swiss chocolate, bolstered by unbroken series of medals at international exhibitions, has not only fallen upon the ears of foreigners. It has also conquered Swiss palates.───瑞士巧克力已经在国际上展现出它的独特魅力。

Li Lei's bronze series, "Fallen Angels", encompasses the most quintessential expression of emotion.───李磊的铜雕《失落的天使》包含了情感宣泄的本质。

His Malazan Book of the Fallen series is one the best works of writing I've ever come across.───他的《玛拉兹英灵录》系列是我读过的最好的书作。