On a hot summer day, when drought conditions peak, something as small as a spark from a train car "s wheel striking the track can ignite a raging wildfire."

在炎炎夏日的一天，当到达了最干旱的条件时，像被汽车轮胎压过的如火光一样小的东西就能点燃一场森林大火。

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Traditional air-bag systems mounted in the car's steering wheel and elsewhere use a hot gas to rapidly inflate the bag during a crash.

WSJ: Five New Technologies to Make Driving Easier