下面的东西摘自 2015 年浙江卷的阅读理解第 C 文，不太理解画线部分，求教专家连贯翻译一下：Living in a glare of our own making, we have cut ourselves off from our evolutionary and cultural heritage—the light of the stars and the rhythms of day and night. In a ver...
The villagers and towns were usually perched ontheedge, so as not to waste arable soil and because there was a need to live beyond the reach of the annual floods.这里and because为什么可以这么用？
... ▲ontheedge of one’s
seat▲tick all the right boxes▲put on▲live up to▲to some extent▲in one’s own right▲be full of confidence▲Peking Opera▲transform...into▲tick all the right boxes▲base...on▲all too often▲result in▲within...in mind▲turn to doing说明：未加...
...，没棱角儿，也没平面儿。Thus my uncle had wanted to use it for the gable when he was building a
house, but he was troubled to find it of very irregular shape, with no edges
nor corners, nor a flat plane on it. 老师您好！想请问一下最后为什么要加一个on it，不重复吗...
...单元 The Earth其中有句话是讲地球上动物生活的地方：Some live onthe land.这里是该用 live on land 呢？还是这句话理解为有些动物靠从陆地获取资源生活（他们可能生活在水里）？据查资料，live on land 是在陆地上生活；live onthe land ...
The sun was shining very brightly, and yet there was an exhilarating nip in the air, which set an edge to a man's energy.请教老师： set an edge to a man's energy 是什么意思？
Tech companies cover up their hard edges with a wide range of dubious management techniques.科技公司用各种不太靠谱的管理技巧来掩盖自己的硬心肠。问题：请问edge可翻译成"心肠"的意思？在各个字典中都找不到相近意思。