His figure bent earthwards with hard work . 因为工作辛苦，他已经弯腰驼背了。
2.
Of the millio of rocks it throws out of orbit at each visit , some hurtle earthwards ? ? and have several times nearly wiped out life on earth 它每一次访问太阳系时，都从轨道上甩出上百万个岩块，其中一些飞向地球的方向? ?有几次几乎摧毁地球上的生命。
3.
Of the millions of rocks it throws out of orbit at each visit , some hurtle earthwards ? ? and have several times nearly wiped out life on earth 它每一次访问太阳系时，都从轨道上甩出上百万个岩块，其中一些飞向地球的方向? ?有几次几乎摧毁地球上的生命。
4.
However , the radio wave can then reflect back of the earth and become refracted again to return earthwards once more . this can sometimes occur a number of times with little attenuation but some fading 在雷达探测中可以利用此方法，初步确定雷达回波中哪个地区会出现陷获折射回波，为进一步分析从雷达回波反演大气层结提供了可能。
