“你走遍华沙弄不到一支这样的雪茄，”赫尔曼不满地说。
"You can't get a cigar like this in all Warsaw," Herman complained.
假设我们弄不到足够的食物，那我们怎么办？
Suppose/Supposing we can't get enough food, what shall we do?
老师有丰富的教学经验可以保证我们不走弯路，让我们很快弄明白我们应该明白的一切，这一点是我们自学所做不到的。
Teachers have rich experience which can help ensure that we learn more effectively and that we can quickly understand what we should understand. This will be hard to achieve if we learn by ourselves.
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