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Dark matter 's gravitational pull bends light , so clumps of dark matter distort the appearance of galaxies in the background .

由于暗物质的引力使光线折射，所以暗物质块扭曲背景中的星系外观。

Because these heavy particles are " cold " -- meaning they move slowly -- they can condense to form very small clumps , as well as very big ones .

由于这些重粒子是“冷”的意味着它们移动很慢，所以它们可以凝结，形成大型物质块，也可以形成很小的物质块。

As a malignant tumour progresses , cells or clumps of cells break off and spread , or metastasise , around the body via the lymphatic system and blood vessels .

随着恶性肿瘤发展，细胞或者细胞块会突破肿块并通过淋巴系统和血管扩散或者转移到机体其他部位。

The end result is a blood vessel clogged with clumps of fat .

最终的结果就是血管被一团又一团的脂肪所阻塞。

The result was weaker , darker paper , with knots and clumps of fiber in the finished sheets .

结果制成的纸张容易破损，呈黑色，纸上到处是纤维结节和结块。