需要: 1.(应该有或必须有) need; want; require; demand; do with 短语和例子需要立即采取行动 require immediate action; 她需要休息。 she is in need of a rest. 我们需要一个和平的国际环境。 we want [need] a peaceful international environment
扩散: spread; diffuse; proliferate; scatter about; irradiation; diffusion 短语和例子扩散光 diffuse light; 癌扩散 proliferation of cancer; spread of cancer; 病菌扩散 proliferation of germs; 核扩散 nuclear prolifer
