And regular hand washing is one simple, if apparently difficult to enforce, solution.
而定期洗手，尽管表面上看起来比较难做到，但却是最简单的解决方法。
Control would be very difficult to enforce.
控制将是非常难以执行。
That rules look fine on paper but are difficult to enforce.
这一规定表面看来很合理但付诸实施仍有困难。
The new law about safety belts in cars was difficult to enforce at first.
规定系汽车安全带的新法规开始时是很难实施的。
The new law about safety belts in cars was difficult to enforce at first.
规定系汽车安全带的新法规开始时是很难实施的。
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