Some areas should be kept secure as a failsafe because mustard gas can be very persistent in the environment, he warned.
部分地区必须采用故障保险机制，因为芥子气在环境中可以长久的存留。
2
Thee persistent haze weather, around the introduction of a number of measures to improve air quality, such as vehicles, the elimination of old vehicles, replacing oil by gas and so on.
针对持续的雾霾天气，各地出台不少措施来改善空气质量，如限制车辆出行，淘汰老旧车辆，以气代油等等。
3
In effect, bond market investors are slamming down on the gas pedal while Banks, burdened by persistent regulatory demands, still have their foot on the brake.