a. 不需要的, 不必要的相关词组: needless to say

need/needless/necessary/require/requirement/want
记忆：
1. need [ ni:d ]　n. 需要, 必需, 必需品, 要求, 贫困　vt.需要　　modal n.必要, 必须(用在否定句和疑问句中) The city is in great need of civilized civilians.城市非常需要文明公民。 注意：某事需要做：Something needs to be done 或 Something needs doing
2. needless [ 5ni:dlis ]　　adj. 不需要的, 不必要的 Every civilian is supposed to be polite, needless to say the officials.每个公民都要讲礼貌，更不用说公务员。
3. necessary [ 5nesisEri ]　　adj. 需要的, 必要的 It’s necessary to repeat the game rules to them.有必要向他们重申一下游戏规则。
4. require [ ri5kwaiE ]　　vt. 需要, 要求 They required that the machine be sent to the repairman as it required repairing at once.由于机器需要马上修理，他们要求把机器送到修理工那儿去。 注意：某事需要做：Something requires to be done 或 Something requires doing
5. requirement [ ri5kwaiEmEnt ]　n. 需要, 要求 I’m afraid you can’t meet the requirements of our new secretary.恐怕你不能满足我们对秘书的要求。
6. want [ wCnt] vt. 想要, 需要, 短缺, 缺少 n.需要, 短缺 The project wants our hearty cooperation. 这项工程需要我们的真诚合作。注意：某事需要做：Something wants to be done 或 Something wants doing 格言：The more you get, the more you want. 得到越多，想的越多。
另类阅读：
I want to make it clear that it’s necessary to meet the requirements. We need to practice. Our abilities need improving.