An over-temperature alarm and interlock is provided on the gases leaving the concentrating tower.

在离开浓缩塔的气体中安置有超温报警器和联锁装置。

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When people found enemy troops approaching, they would send smoke signals from the tower as an alarm.

每当人们发现敌人靠近时，他们就会从台上燃起狼烟作为警报。

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Both Jixin and Weiju were fuels used by the beacon tower for being lighted to give out fire or smoke to communicate alarm signals.

积薪和苇苣均是烽燧所用燃料，用以点火或举烟传递报警信号。

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Congressional Republicans have criticized the planned tower closures, saying the administration is "creating alarm" as a negotiating gambit.

CNN: FAA begins process to close 168 towers on April 1