Normally, uric acid dissovles in the blood and passes through the kidneys into urine. But sometimes the body either produces too much uric acid or the kidneys excrete too little uric acid. When this happens, uric acid can build up, forming sharp, needle-like urate crystals in a joint or surrouding tissue that cause pain, inflammation and swelling.
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When this happens, uric acid can build up, forming sharp, needle-like urate crystals in a joint or surrounding tissue that cause pain, inflammation and swelling.
当这种情况发生时，尿酸就会累积，形成尖锐的，像针尖一样的尿酸结石沉积在关节或组织周围，引起疼痛，炎症和肿胀！
The contact between fluids is usually gradual rather than sharp, forming a transition zone of mixed fluid.
流体间的接触面常常是渐变的而不是突变的，形成一个混合液体的过渡带。
Over the snow peaks clouds were forming, heavy and dark; probably it would rain later on but now the shadows were very sharp with the sun bright and clear.
云在雪山顶上形成，沉重而又暗黑，或许稍后会下雨，可是现在阴影非常强烈，阳光明亮又清晰。
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