His figure bent earthwards with hard work . 因?yàn)楣ぷ餍量?,他已?jīng)彎腰駝背了。
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 它每一次訪問太陽(yáng)系時(shí),都從軌道上甩出上百萬個(gè)巖塊,其中一些飛向地球的方向? ?有幾次幾乎摧毀地球上的生命。
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 它每一次訪問太陽(yáng)系時(shí),都從軌道上甩出上百萬個(gè)巖塊,其中一些飛向地球的方向? ?有幾次幾乎摧毀地球上的生命。
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 在雷達(dá)探測(cè)中可以利用此方法,初步確定雷達(dá)回波中哪個(gè)地區(qū)會(huì)出現(xiàn)陷獲折射回波,為進(jìn)一步分析從雷達(dá)回波反演大氣層結(jié)提供了可能。