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20. Every Saturday science museum is crowded with a lot of middle school students and some teachers are busy explaining the 1 secret behind a lot of interesting experiments.每周六，科学博物馆里挤满了中学生，而老师忙于解释许多有趣实验背后的科学奥秘。
①science[saiens] n科学;学科
②museum[mju(:)zim] n.博物馆
③crowd[kraud]n人群，群众:一群v聚集;挤满;挤，推be crowded with 聚满/挤满了.....
④a lot of['lot v]大量的，许多的
⑤busy[bizi] a.忙的;繁忙的 be busy doing sth 忙于做......
⑥explain[iksplein] v讲解，解释，说明⑦scientific[saintifik] a.科学的
⑧secret[sikrit] a秘密的，机密的n秘密⑨behind[bihaind] prep.在...后;落后于
⑩experimentiksperimnt]n.实验，试验vi(on，with)作实验
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蕾蕾英语课堂
20. Every Saturday science museum is crowded with a lot of middle school students, and some teachers are busy explaining the scientific secret behind a lot of interesting experiments. 每周六，科学博物馆里挤满了中学生，而老师忙于解释许多有趣实验背后的科学奥秘。