I had forgotten all about the snails when Robert suddenly said that I must stay to dinner.
我把蝸牛的事已忘得一干二凈，羅伯特突然提出一定要我留下來吃晚飯，這才提醒了我。
新概念英語第三冊
Lesson 23 One man's meat is another man's poison
?? 句中詞匯解析
從本句中提取的重要詞匯
adv. 意外地，忽然地;奄;勃;霍然;
?? sudden突然的 + ly ...地 → adv.突然地
"Suddenly he found himself awake and fully alert."
突然他發覺自己醒了過來，而且高度警覺。
近義：impromptu, inadvertently, abruptly, offhand, overnight, sharply
反義：progressively, slowly, sparingly, stingily, inchmeal, consecutively
forget的過去分詞
近義：neglected, unremembered, abandoned, forsaken
反義：hidden, protege, protegee, sheltered, covered, guarded
adj. [律]上述的;少說為妙;（做）某事有/沒有很多優點（或好處）：某事物有/沒有多少可說的;說到底;
v. 說，講( say的過去式和過去分詞 );表明;念;說明;
"Afterwards she was sorry for what she'd said."
后來她后悔說了那些話。
近義：indicated, spoken, stated, this, aforementioned, aforesaid
aux. 必須;必然要;（做出邏輯推斷）;（表示堅持）;
n. 必須做的事，必不可少的事物;葡萄汁;霉臭;麝香;
vt.& vi. （表示必要或很重要）必須;（提出建議）應該;得;（表示很可能或符合邏輯）一定;
adj. 不可或缺的;狂暴的;
"You must be able to speak French for this job."
干這項工作你得會說法語。
近義：ought, should, necessaries, necessity, precondition, prerequisite
vt.& vi. 停留;停止;堅持;抑制;
vi. 繼續處于某種狀態;
n. 逗留;延期;倚靠;忍耐;
?? 停留停（t）下來說（say）話
"You cannot stay here ad infinitum without paying rent."
你不付房租就不能永遠住在這里。
近義：remain, abide, endure, hold, interrupt, postpone
反義：migrate, absquatulate, retire, retreat, scat, transmigrate