Sounds are transmitted more efficiently through solid tissue than through tissue containing air . 声音通过致密组织传播要比通过含气组织传播更为有效。
The study also showed cancers were 18 times more likely in women with the densest breasts within the first year of the study screening , due to dense tissue masking tumours 研究同时发现,癌症在筛查的第一年在最致密乳房的发生肿瘤的几率增加18倍,因为致密组织掩盖了肿瘤。