Medicare costs are more difficult to control, but not impossible.
Medicare的花销控制起来要难得多，但并非不可能。
But he may make more difficult to control for his successors.
但是他也有可能使他的继任者们更加难以控制该行。
It's part of football but it's difficult to control.
这就是足球的一部分，很难掌控。
Emotion, although difficult to control, but it is a powerful force.
感情虽然难以控制，但却是一种强大的动力。
But he found it difficult to control the drift of his inspiration.
但他发现很难控制住飘忽不定的灵感。
Rage can be directed, but it is very difficult to control.
狂怒可以被定向，但是非常难以控制。
Cohort study has a high clinical operation, but it is difficult to control bias.
队列研究临床可操作性高，但其控制偏倚差。
Cohort study has a high clinical operation, but it is difficult to control bias.
队列研究临床可操作性高，但其控制偏倚差。
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