The waist is too tight, the body of the waist with the mouth bound waist bone and muscle, not only affects the blood circulation and nutrition supply, and often make the waist pain.
腰部是身体的支柱，过紧的腰口束缚着腰部的骨骼和肌肉，不仅影响那里的血液流通与营养供应，而且往往使腰痛加重。
They also provided a heuristic with the worst-case performance ratio of 5/3, and this bound is tight.
他们也给出了一个启发式算法，它的最差执行比为5／3，并且这个界是紧的。
Robert Jordan felt his own breath tight now as though a strand of wire bound his chest.
罗伯特，乔丹这时觉得自己呼吸紧迫，仿佛有一圈铁丝捆住了他的胸脯。
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