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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