Stel
abbr. 短时间接触容许浓度（Short term exposure limit）
🗣️ 情景例句
And miles to go before I sleep.
在我就寝前还得赶许多哩路。
A man knows his companion in a long journey and a little inn.
路遥知马力，日久见人心。
Is this a map?
这是一张地图吗？