必需

méi hé tiě shì fā zhǎn xiàn dài gōng yè bì xū de yuán liào

煤和铁是发展现代工业必需的原料。

Coal and iron are essential to the development of modern industry.

shēn tǐ jiàn kāng suǒ bì xū de yíng yǎng wù

身体健康所必需的营养物

nutrients necessary for good health

yǎng qì duì yú wán chéng xún huán lái shuō shì bì xū de

氧气对于完成循环来说是必需的。

To complete the cycle, oxygen is necessary.

guān zhù xì jié shì zhè ge gōng zuò suǒ bì xū de

关注细节是这个工作所必需的。

Attention to detail is essential in this job.