阻挡物 meaning in English

restraining mass

The basic stumbling block to global peace rests with the self - serving ambitions of many nations
全世界和平的根本基本阻挡物再于许多国家谋私利的野心。
Diffraction - not only will a wave of sound reflect or absorb but it can go over the obstacle . that is why we can hear somebody even with a baffle between
衍射声音虽然会被反射已经吸收，但是他能绕过阻挡物。这个就是为什么能听到某人在阻挡物后面说哈的声音了。
It has been found that certain bats emit squeaks and by receiving the echoes , they can locate and steer clear of obstacles ? ? or locate flying insects on which they feed
人们已经发觉，某些蝙蝠发出尖叫声并靠接纳回响来锁定和避免阻挡物? ?或者找到它们赖以为生的昆虫。