词汇：

　　appreciate感激

　　convey / express one’s appreciation表示感激

　　cordial衷心的

　　beyond words难以言表

　　courtesy礼貌

　　generosity慷慨

　　grateful感谢

　　gratitude感激之情

　　hospitality好客

　　moved感动

　　timely及时的

　　句型：

　　1) I take this opportunity to express to you my deep appreciation for the kind assistance you rendered me.

　　2) I wish there were a better word than “thanks” to express my appreciation for you generous help.

　　3) My appreciation to you for your generous help is beyond words. I wish I could repay it one day.

　　4) Please accept my most cordial thanks for your timely help, which I will always remember.

　　5) Thank you from the bottom of my heart for your kind help.