but also extremely difficult
但也非常困难
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But it is also this natural tendency that makes trading (which looks like it should be easy) extremely difficult.
但是就是这个自然倾向导致交易(看起来很简单)极度困难。
youdao
But he was also extremely large and difficult to control.
VOA: special.2009.02.23
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