America is rightfully worried about its sinking competitiveness, and does indeed need to improve its education system.
美国对自己竞争力下降的担忧不无道理，它也确实需要改进它的教育体系。
2
A system of sensors and mirrors would signal the tiniest sinking-in theory.
理论上说，最轻微的地表下沉都可以被传感器和反射镜组成的系统感测出来。
3
From subgrade sinking, construction methods and structure system, the paper analyzes reasons for vehicle bump at bridge head, and advances measures to avoid it.