但是、由于林隙结构极为复杂，难以精确地测量林隙上方和周围树冠空隙的透光情况。
However, because of difficulties in measuring light attenuation in canopy gap and complex structure of forest canopies.
根据我们的普遍经验，双层外立面是极为复杂和昂贵的结构，通常只能由一些出口公司制造。
According to our widespread experience a double skin facade is a very complicated and expensive construction which can only be built by expert companies.
电机结构图由于图形复杂手工绘制是极为费事的，而且稍有改动，整张图纸就要重新绘制，确实是一项费时费力的工作。
The drawing of electrical machines, if Plotted by, manual operations, is very complicated because it is complex and difficult to be modified.
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