第一段词汇解析①instructing = ordering, telling。②give up the search = stop looking。③precious = valuable。第二段词汇解析①tremendous = a lot of, a great deal of。②were at first under the impression = thought at first。③wrong = mistaken。第三段词汇解析①possible = available。Notes 学习笔记词组归纳1.salvage operation2.on sb.’s way home3.instruct sb. to do sth.4.sea bed5.on board6.at first under the impression7.personal belongings8.together with9.of value10.of great interest11.log book12.piece together13.come to light14.in a convoy15.ministry of defence16.the war museum语言点Sub 这个前缀的用途小结：①下： subway 地铁;②次、亚： subculture 亚文化;③副、分支： subeditor 副编辑;④接近的： subadult 快成年的;⑤再： subdived 细分。