strategy
n. 战略学, 兵法;战略, 策略; 策略, 计谋
联想：tactics战术，strategy战略
tactical 战术的，strategie 战略的
1.I admired the general who was a master of strategy.
我敬佩那位精通兵法的将军。
2.By careful strategy she negotiated a substantial pay rise.
她精心策划后, 谈妥了大幅增加工资的事。
3.It must be a strategy to make me let him go on holiday alone.
这一定是他用的计, 好叫我让他独自一个人去度假。
stream
n. 小河, 溪流;流, 一股, 一串;水流方向, 潮流
vt. & vi. 流; 流动
vi. 飘扬; 招展
辨析：从大到小：river（江，河）>stream(溪，水流) >brook(小溪)
1.Can you jump across the stream?
你能跳过这条小溪吗?
2.A stream of people was going into the cinema.
一股人流走进影院。
3.He hasn't the courage to go against the stream of public opinion.
他没有勇气逆舆论潮流行事。
4.Blood streamed from the wound.
血从伤口流出。
5.The flag was streaming in the wind.
旗帜在风中飘动。
strengthen
vt. & vi. 加强, 巩固
1.The wind strengthened during the night.
夜里风刮得更大了。
2.We should strengthen education on both these points.
我们要加强这方面的教育。
sufficient
adj. 足够的; 充足的
辨析：enough指愿望上的满足，而sufficient则指需要的、达到目的的“满足”，所以事实上常常已经sufficient，但并不感到enough。
1.We have gained sufficient experience to tackle this problem.
我们已经有了足够的经验来处理这个问题。
2.The essential difficulty is finding the sufficient raw material.
主要的困难是找到足够的原材料。
3.Do we have sufficient food and water in stock?
我们有足够的现备食物和水吗？
