requirement [rɪˈkwaɪrmənt]

n.要求;必要条件;必需品，需要量;资格

[例]The company recommended shareholders oppose the requirement.

该公司建议股东反对这个要求。

demand [dɪˈmænd]

n.需求;需要;要求，请求;销路

[例]And that means a continuing drive to reduce oil demand.

而这也意味着要做到持续降低对石油的需求。

need [nid]

n. 需要;需要的东西;责任;贫穷

[例]I feel a need to talk to you about it.

我觉得有必要跟你谈谈那件事。

request [rɪˈkwɛst]

n.要求;需要;所请求的事物;申请书

[例]I will oblige any sincere request.

我会答应任何诚意的请求。

necessity [nəˈsɛsɪti]

n. 必要（性）;（迫切）需要;必需品;自然规律

[例]Asem has yet to prove its necessity.

亚欧会议的必要性还有待证实。