visible grain的意思|示意

The pumpkin pollen grain in the middle is0.2mm and just about visible to the naked eye

中间的南瓜花粉有0.2毫米，肉眼刚刚能看见。

1 white translucent translucent particles particles, which may be entrained metal chips and sand, containing visible black white grain percentage more than 1 visual inspection.

外观白色半透明颗粒半透明颗粒，其中不得夹带金属屑和砂粒，含有可见的黑点粒白色分数不超过1目测。

The results Show that the floating dust in Tarim Basin is monitored in the infrared and visible images, floating dust in it is gray with even grain and distinct verge.

分析结果表明，红外云图和可见光图像能够监测盆地浮尘的变化，浮尘呈灰色，纹理均匀，边界清晰。