YSK the business of body donation for "science" can include things like the military blowing up your body for ballistics tests. It's also a for-profit business where bodies or body parts are sold by brokers who make money on the donation.
from /r/YouShouldKnow
YSK... ...为 "科学 "而捐献身体的业务包括诸如军方炸毁你的身体进行弹道测试。这也是一种营利性业务，尸体或身体部位由经纪人出售，他们从捐赠中赚钱。