lack: may imply either an absence OR a shortage in supply: a club that ~s a room to meet in. absence缺席，不在
want: adds to lack the implication of needing or desiring urgently: you may have whatever you ~. 这里urgent迫切没有译出，也不需辨析
need: stresses urgent necessity more than absence or shortage: everyone ~s a friend.
require: is often interchangeable with need but it may heighten the implication of urgent necessity: a situation that ~d drastic measures.
lack缺乏: 可指完全没有或数量不足，want需要: 指缺乏并且需要，need需要: 强调需要而非缺乏，require迫切需要: 进一步强调迫切需要，与need可互换
记忆方法: 1）首字母LWNR想成左右为难<==缺乏 "缺"是形声字，本义是"器具破损"，从缶夬声。"缶"fǒu是瓦器，"夬"也表意: 水缺为"决"，玉缺为"玦"，器缺为"缺"，都有"破损"的意思，说文:"缺，器破也"。引申为"缺漏不完整"，如缺失缺陷缺勤缺氧缺编瘦缺肥缺宁缺毋滥 "乏"有2个意思 1、缺少，如乏味贫乏不乏 2、疲倦，如乏困乏累疲乏。"乏"是会意字，从丿从之。"丿"发音"撇"是否定性质的符号，表示"不"；"之"意为"到、达"，引申为"足、够"。丿与之联用表示"不到不达"或"不足不够"。本义是"削减、减损"。 所有含有"乏"的字都有削减减损的意思，如"贬"字从贝从乏，意为"价值减损、降低"，"眨"字意为"目力输出减少"，"泛"字意为"水量因溢出而减损" "欠"本义是"打哈欠"，人在疲倦时张口出气，字形上像张开的口在出气；气出则不足，引申为"不够不足"，如欠缺亏欠；又引申为"该归还的没有归还"或"该给的没有给"，如欠债欠人情欠条。包含欠的字多和"气息"有关，如欢欣吹
2）缺乏的意思是缺少必需的mean to be without something essential or greatly desired. （essential本质的必不可少的implies what belongs to the nature of a thing and cannot be removed without destroying the thing，如conflict is an essential element in drama矛盾是戏剧不可缺少的元素）
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