短篇么？walkerslook, cross, left and right, carefully... drivers/riders drink, slow down, wear a seat be.lt（系安全带）， traffic lights,a helmet（头盔）,fast... passengersget on/off, push, wait, in line... In order...
短篇么？walkerslook, cross, left and right, carefully... drivers/riders drink, slow down, wear a seat be.lt（系安全带）， traffic lights,a helmet（头盔）,fast... passengersget on/off, push, wait, in line... In order...