boulder
n. (受水或天气侵蚀而成的)巨石,巨砾
复数 boulders
例句
Boulder was one of the first cities in the nation to enforce a ban on smoking.
博尔德是该国率先施行禁烟令的城市之一。
《柯林斯英汉双解大词典》
Given enough warning, it should be possible to push a threatening boulder out of the way.
如果予以足够的警示,就有可能把一块有威胁性的巨石推开。
Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.
一旦你开始让巨石滚动,巨石就会产生动量,这是由其质量和速度决定的。