什么破書(shū),扔掉算了,根本不是狀語(yǔ).
你說(shuō)的倒是差不多,語(yǔ)法的表述是：
to travel the quarter of a million miles from the Moon to Earth-orbit 是實(shí)際的主語(yǔ)；
it 是形式主語(yǔ),指代的就是to travel the quarter of a million miles from the Moon to Earth-orbit
如果不用形式主語(yǔ),句子就是：
To travel the quarter of a million miles from the Moon to Earth-orbit requires 97 per cent less energy than the 200 mile-journey from Earth's surface into orbit!
由于主語(yǔ)過(guò)長(zhǎng),句子顯得頭重腳輕,所以用形式主語(yǔ)it,用不定式作實(shí)際主語(yǔ),使句子結(jié)構(gòu)平衡.