What is white dust, and should I be concerned about it?

什么是白色的粉尘，我应该很关注呢？

youdao

Today, I played with the white dust on the counter at work for the last time.

今天是我最后一次玩弄柜台上的白色灰尘。

youdao

White dust is not harmful, and may settle on surfaces and furniture near the humidifier.

白尘是无害的，而且可能解决的表面及附近的加湿器家具。

youdao

One rocket leaves the launch pad, executes a 90-degree turn about 50 feet off the ground, streaks at several hundred miles an hour straight toward a group of landsailers, crashing just short of them in a cloud of white dust.

FORBES: "Let's Punch A Hole In the Sky"

Residents carried the injured into ambulances and one man carried a small child caked white with dust from the wreckage.

WSJ: Mumbai Building Collapse Kills at Least 35

Drifts of sparkling white marble dust surround the block.

BBC: The spirit of the Italian Lakes