Cancer is a leading cause of death around the world.
cancer
a very serious disease in which cells in one part of the body start to grow in a way that is not normal
癌症
tumour
/ˈtuːmər/
a mass of diseased cells in your body that have divided and increased too quickly
肿瘤
leading
best, most important, or most successful
He played a leading part in the negotiations.
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