单词	clam
释义	noun | verb clamclam1 /klæm/ noun [countable] Etymology ETYMOLOGYclam1 Origin: 1500-1600 clam two-part fastener (14-20 centuries), from Old English clamm chain, rope, etc. for tying something up; from the tight shutting of a clam shell 1 a shellfish that you can eat, which has a shell in two parts that open and close2as happy as a clam informal very happy3informal someone who does not say what he or she is thinking or feeling4[usually plural] old-fashioned informal a dollar noun | verb clamclam2 verb (clammed, clamming) Verb Table VERB TABLE clam Simple Form Present I, you, we, they clam he, she, it clams Past I, you, he, she, it, we, they clammed Present perfect I, you, we, they have clammed he, she, it has clammed Past perfect I, you, he, she, it, we, they had clammed Future I, you, he, she, it, we, they will clam Future perfect I, you, he, she, it, we, they will have clammed Continuous Form Present I am clamming he, she, it is clamming you, we, they are clamming Past I, he, she, it was clamming you, we, they were clamming Present perfect I, you, we, they have been clamming he, she, it has been clamming Past perfect I, you, he, she, it, we, they had been clamming Future I, you, he, she, it, we, they will be clamming Future perfect I, you, he, she, it, we, they will have been clamming clam up phrasal verb informal to suddenly stop talking, especially when you are nervous, shy, or unhappy:  A lot of men just clam up when they’re having emotional problems.
随便看	röntgen S -'s sabbatarian Sabbath sabbatical saber saber-rattling Sabin, Albert sable sabotage saboteur sac Sacajawea saccharin saccharine sacerdotal sachem sachet sack sackcloth sack race sacrament sacramental Sacramento

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