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1.submarine n．潜艇(a naval vessel designed to operate underwater)
词根记忆：sub(下面)+marine(海洋)--在海下面行进的--潜艇
例：nuclear submarine核潜艇
2.submit v.提交( to present or propose to another for review consideration, or decision);(to)屈从(to yield)
词根记忆：sub(下面)+mit(送，发)--从下往上送--提交
例：The article based on experiments was submitted for publication last year. //The peasants submitted themselves to the queen's rule.
派生词：submission(n．屈服，服从)
3.subordinate a．(to)下级的( inferior)；n.下级(a person who is subordinate)
词根记忆：sub(下面)+ordin（顺序）+ate--顺序在下面的--下级的
例：The new recruit was subordinate to all of the officers.//The supervisor blamed one of his subordinates for the mistake.
4.subscribe v.（to）订阅（to receive a periodical or service regularly on order)
词根记忆：sub(下面)+scribe(写)--写下订单--订阅
例：subscribe to a magazine订阅杂志
派生词：subscriber(n.订购者)；subscription(n．捐助；订购)
5.subscription n．捐献(donation)；订阅(a payment for consecutive issues of a newspaper or magazine for a given period of time);签署(the act of signing one's name)
词根记忆：来自subscribe（v.订阅）
例：Many of the magazine's long-time subscribers would continue their subscriptions even if the subscription price were increased.
同根词：transcribe（v.抄写，誊写）
6.subsequent a．随后的，接续的(following in time，order，or place)
词根记忆：sub（下面）+sequ（跟随）+ent--下面跟着的--随后的
例：The company plans to continue add.ng new departments and services in subsequent years．
派生词：subsequently（ad后来；随后）
v. 抄写，誉写，改编(乐曲)，转录
