To make an airplane contrail, you need water and some kind of microscopic particle for the water to condense around.

创造一条飞机的轨迹，你需要一些水和一种能让水在它周围压缩和微小粒子。

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The key is using a microscopic particle that zeroes in on blood vessels around the tumor to deliver low doses of the drug in a more concentrated way.

其中的关键是用微粒瞄准肿瘤周围的血管，低剂量的药物以较为集中地方式给药。

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This paper discusses the fundamental problem of the explanation on quantum mechanics-is microscopic particle something real or something existing objectively?

本文讨论了量子力学解释中的最基本问题——微观粒子是否真实和客观的存在。

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