Between 1850 and 1910 the bison population is thought to have fallen from 60 million to just a few hundred.
人们认为,在1850年到1910年之间,野牛的头数从6,000万头降到只有几百头了。
It took him some time to connect the long rubber pipe to the air supply pipe that ran round the port, but at last it was done and as a result work was able to progress much faster.