According to the new traffic rules, people must wear a helmet when riding an e-bike.
根据新的交通规则，人们骑电动车时必须戴头盔。
On a bike you must wear a helmet.
在骑自行车的时候，请你戴上头盔。
Entering the site must wear a helmet.
进入工地现场，必须佩带安全帽。
All the competitors must supply their own safety equipment and must wear a helmet. Gas and electric powered bikes are not permitted.
参赛者自备参赛车辆、装备与护具，所有车辆不得配有任何非人力传动、助动装置。
Performing under the name Jaimi Starr, she cannot wear a helmet as this would affect the drag and she must keep a constant speed to beat the gravity that would otherwise pull her down.
泰利尔的艺名是贾米斯塔尔，在演出过程中她不能戴头盔，因为这可能会影响骑行。在骑行过程中她必须保持恒速前进，才能够克服重力不掉下来。
Riderss must wear a full face helmet (either fixed or detachable) at all times during the race including liaison stages on the bike.
车手在比赛期间必须佩戴全盔(固定式和可拆分式)，包括骑车通过的转移路段在内。
All participants must wear a safety helmet or bike helmet during the race.
所有参赛者必须佩戴安全帽或单车头盔进行比赛。
All participants must wear a safety helmet or bike helmet during the race.
所有参赛者必须佩戴安全帽或单车头盔进行比赛。
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