kinetic adj. 运动的(of or resulting from motion);动力学的(of or relating to kinetic art)
[记]词根记忆：kine(动)+tic→运动的
know-how n. 专业技能，知识(practical ability or skill)
[记]分拆联想：know+how→知道如何做→专业技能
[例]The technical know-how, if not the political commitment, appears already at hand to feed the world’s exploding population and so to eradicate at last the ancient scourges of malnutrition and famine.
laborious adj. 费力的，艰难的(involving or characterized by hard or toilsome effort)
lackadaisical adj. 无精打采的(listless;languid);无兴趣的(showing lack of interest)
[记]分拆联想：lack(缺少)+a+daisi(=daisy第一流人物)+cal→缺少第一流人物让人无精打采
laconic adj. 简洁的(brief or terse in speech or expression;concise)
[记]来自古希腊王国Laconia(拉哥尼亚)，以说话简洁而闻名
[同]concise, brief, curt, succinct, terse
laggard adj. 缓慢的(slow or late);落后的(falling behind);n. 落后者(one that lags or lingers)
[记]lag(落后)+gard(构词成分)→落后的
lament vt. 悲伤;哀悼(to express sorrow, mourning, or regret for often demonstratively)
languid adj. 没精打采的，倦怠的(drooping or flagging from or as if from exhaustion)
largesse n. 慷慨(generosity)
[记]词根记忆：large(大)+sse→大方
[例]Famous among job seekers for its largesse , the company, quite apart from generous salaries, bestowed on its executives annual bonuses and such perquisites as low-interest home mortgages and company cars.