1.lowbrow：a. 无知识的，无文化修养的
Let ' s find sth . that highbrows and lowbrows alike can enjoy.怎样才能雅俗共赏才好。
2.lubricant：n. 润滑油
3.lucid：a. 1. 明白易懂的2.头脑清醒的
His explanation was lucid and to the point.他的解释扼要易懂。
4.lucrative：a. 赚钱的
She has a lucrative business selling leather goods.她做皮货生意, 利润丰厚。
5.ludicrous：a. 可笑的，愚蠢的
Grandad looks absolutely ludicrous in old sunhat.外公戴着一顶老式遮阳帽显得滑稽可笑。
6.lukewarm：a. 1.（液体）微温德2.不热心的
His plan got a lukewarm reception from the committee.他的计划遭到委员会的冷淡对待。
7.lullaby：n. 摇篮曲，催眠曲
8.lunacy：n. 精神错乱
9.luncheon：n. 午餐会
10.lurch：v. 蹒跚而行，突然倾斜n. 蹒跚的步态
leave sb in the lurch 弃某人于危难之中