Then three issue, four issues analogize in turn, the price rises suddenly by the artificial control.

然后三期 、 四期依次类推, 房价被人为操控猛涨.

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But the oil production is complicated, and is very difficult by artificial control.

由于油井生产过程的复杂性, 靠人工控制掺入井下水蒸汽的流量十分困难.

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