DirectByteBuffers分配内存很慢，但用起来非常快。
DirectByteBuffers are slow to allocate, but very fast to use.
他跑得非常快，但那只熊正好比他快一点，一步步逼近他。
He ran pretty fast but the bear was just a little faster and gained on him with every step.
一种方法非常快，但成功的概率有限；另一种非常慢，但成功的可能性很高。
One was quite fast, but had a limited probability of succeeding. The other way of doing it was quite slow, but had a very good probability of working.
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