This sealing structure is simple and easy to install, but pressed edge sealing small, and difficult to regulate.

这种密封结构简单，安装方便，但是密封压紧力小，且不易调节。

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Several markets have become more opaque and difficult to regulate, as the current credit crisis in the US and Europe illustrates, says the report.

报告指出，正如当前美国和欧洲次贷危机所揭示的，一些市场变得更不透明，也更难以调控。

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In theory, most states are trying to regulate them, but the rules are full of loopholes and enforcement is difficult.

理论上，大部分州正在试图对其进行管理，但规定充满了漏洞，实施起来很难。

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Small farms are often difficult to track and regulate, making it difficult to spot where problems enter the food supply.

WSJ: 'China's No. 1 Butcher' Turns to U.S.

Unlike hospitals, which operate under the rubric of large regulatory agencies, physicians have been much more difficult to regulate and monitor.

WSJ: David Leffell: The Doctor's Office as Union Shop

Unfortunately, the response to the crisis so far has been to encourage the takeover of ailing institutions, creating financial supermarkets that are more complex, more difficult to manage and regulate, and that have more un-priced guarantees.

FORBES: Get Briefed: Thomas Cooley