The rail system was chosen because the cost of energy is not so great as with a bus system because it is much easier to carry a great number of passengers by train than by bus or car, and because the noise and pollution is not so great as with buses and cars. 句中as with是什么意思？
Once, the only way to profit from fashion as a collectable item was to buy rare ,vintage or antique garment in mint conditon-an expensive business and still ( ) which offers relatively risky return. 请问老师此处为什么不能填is？
可以理解填something 或 one，不能填is ...
...speed railway a
reality, the China Railway
Corporation had busied /hasbeen
busying itself in laying down over 25000 km of high-speed tracks over the past ten
years - accounting for roughly two thirds of the world's total length of
high-speed lines. 请教老师，这里为什么用过去完成...
...个句子（在百度上可查到）：He sang much more sweetly than he has before. 他的演唱比以前要动听许多。不明白句子中than he has before的时态。按理说，这里的 than he has before 应该是than he has sung before的省略，但无论从哪方面来看，这都有问...
...开车，她10岁的女儿坐在后面。
In the car accident the mother was killed, but her two-year-old son was found alive. 在这次车祸中，母亲死了，但是她两岁的儿子却还活着。
但是 25-year-old 这样的复合形容词可以用于专有名词的人名吗？比如：
...
...trance with the interest, and also the equanimity (平静), of men who had been forewarned. 这是以前没有看懂的一个句子，不知道把 of men 接到哪里，entrance? 感觉也不对。今天翻出笔记本来把它抄上来，希望老师给讲解一下，这个 of men 是怎么一个...
As if they were all suffering from a sleepless night, or almost done recovering from a broken nose. 问大神，done为什么会在ing前面？网上看这里是be almost done？recovering只是补充？
...hool costs,” Mr Smith remembers. The thought of his son becoming a nurse was too much. Today, Mr. Smith, an official nurse, earns about $ 30000 a year… …1. Take it hard 是“难过”的意思？2． “The thought was... … too much.” 请问老师，这里too much 指的是 “想...
1. Although paper
was never as cheap as it has become today, it was far less expensive than
parchment, and therefore more people could afford to buy books.
2. How do predators
affect populations of the prey animals? The answer is not as simple as might be
thought.
之前认为在比较项修饰的...