electron number densities的用法和樣例：
例句
- Memory foam is a hypoallergenic material and available in several densities.
記憶泡沫是低過敏物質可在數密度。 - Here, we diagnosed the electron density of plasma inside the simulacrum of the radar-dome and did research on improving the capability of the magnetic microwave plasma production.
這裡，主要是進行了雷達艙模擬件中的等離子體電子數密度的實驗測量以及關於磁增強型微波等離子體發生器是否能提高性能的理論和實驗研究。
