以下时 meaning in Chinese

mph

All other common gases are cooled by expansion at room temperature and below it .
所有其它普通气体在室温和室温以下时都会因膨胀而冷却。
Remains open when the severity level is 19 or less
当严重级别为19或以下时，
When the source locates under the interface , the inversed result is obtained
当声源位于地层界面以下时，正好相反。
Rule 3 . sell when prices decline below old top levels or high prices
规则三：当价格下降到历史顶部或高位以下时卖出。
Electrical characteristics for an interface at data signaling rates up to 52 mbit s
数据信令速率在52mbit s及其以下时接口的电气特性

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