虽然他们的工作看似简单，但是他们为维护首都的交通秩序做出了很大的贡献。在绿灯亮的90秒内，有交通协管员的时候，40辆车可以通过十字路口，没有交通协管员的时候只能通过15辆。
"During the green light, which lasts about 90 seconds, about 40 vehicles can pass the crossroad with an assistant keeping the order, " says Zhou Zhentong, leader of Zhongguancun traffic police team.
十字隆凸通常位于上、后半规管壶腹嵴的中部，与壶腹嵴的长轴垂直。
Usually being located at the middle of the cristae of vertical semicircular canals, the eminentia cruciata protrudes perpendicularly to the long axis of the crista.
十字隆凸通常位于上、后半规管壶腹嵴的中部，与壶腹嵴的长轴垂直。
Usually being located at the middle of the cristae of vertical semicircular canals, the eminentia cruciata protrudes perpendicularly to the long axis of the crista.
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