calm zone meaning in Chinese

宁静区
无风带
无风区

Traffic calming zone
交通宁静区
Tropical calm zone
热带无风带
( 2 ) testing and simulating on the tress field indicates that original stress distributing rule and collective character could be compartmentalized two parts : alteration zone in the surface near sloping and stress calm zone in deep
( 2 )地应力场测试和模拟研究表明，隧道通过部位初始应力分布规律的总体特征可划分为近坡面浅表生改造带和深部应力平稳带。