但是什么大小和形状的纳米颗粒的效果最好且生产成本低？
But what size and shape of nanoparticles is most effective and can be produced cheaply?
youdao
这种形状具有低阻力，尽管它是坏不稳定。
Such shape has low drag force , though it is bad unstable.
当太阳升得低的时候，形状是长的。
The shade is long when the sun is (7low).
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