关于字母组合ay，ai的学习

　　含有ay的单词列表：

　　way, say, lay, pay, may, bay, play, clay, stay, spray, stray
away, always, repay, decay, delay, display, dismay
betray, Raymond（雷门，姓氏）, essay, crayon

　　含有ai的单词列表：
aid, maid, raid, paid, laid, afraid
wait, await, bait, strait, straight, gait, gaiter, traitor
mail, nail, fail, failure, sail, sailor, tail, tailor, detail, retail, curtail, prevail
rain, brain, train, strain, drain, drainage, main, remain, gain, pain, paint, faint
saint, plain, complain, complaint, explain, contain, maintain, obtain, sustain
raise, praise, braise
faith（信心）, waive（放弃，与wave同音）

　　多音节单词示例：appraisal（评估）, available（可用的）, maintenance（维护）
painstaking（煞费苦心的）, bayonet（刺刀）

　　例外读音的单词：ays（是“ay”的复数形式）, said（是“say”的过去式）, again（再次）, against（反对）这些单词中的ay/ai均读/e/音。