需 seoi¹ {xū}

(noun) Demand

需 seoi¹ {xū}

1. to require
2. to need
3. to want
4. necessity
5. need

需求 seoi¹ kau⁴ {xūqiú}

(noun) Need

需要 seoi¹ jiu³ {xū yào}

1. to need
2. to want
3. to demand
4. to require
5. requirement
6. need

需求 seoi¹ kau⁴ {xū qiú}

1. requirement
2. to require
3. (economics) demand

需求層次理論〔--层--论〕 seoi¹ kau⁴ cang⁴ ci³ lei⁵ leon⁶ {xū qiú céng cì lǐ lùn}

(Maslow's) hierarchy of needs (psychology)

需要是發明之母〔---发---〕 seoi¹ jiu³ si⁶ faat³ ming⁴ zi¹ mou⁵ {xū yào shì fā míng zhī mǔ}

Necessity is the mother of invention (European proverb).