The theory is that because these stem cells are fetal cells, they are designed to proliferate and give rise to new tissue, which means they have the potential to produce tumors.

由于那些干细胞来自胎儿，它们本来就是要通过自身繁殖来形成新的人体组织，因此理论上它们具有产生肿瘤的潜在可能。

youdao

It will take further experiments to prove the theory and to demonstrate that what's true of stem cells in hair follicles is true of other types of stem cells.

需要进行进一步实验证明该理论，并证明对毛囊中干细胞的正确理论同样适用于其他类型的干细胞。

youdao

In theory stem cells offer the hope of growing new tissues to order, yet in reality, many challenges remain.

理论上，干细胞可以生长出新组织，但在实际中还存在许多挑战。

youdao

In theory, that might stem the drift to home-schooling.

ECONOMIST: Home education

This chemical cascade, called the Wnt pathway, is turned on when organisms are injured, and it could in theory be used to make stem cells that are already present in the heart, brain and other organs regenerate damaged tissue.

FORBES: Regenerators

Such stem cells, then, are as bad as theory suggests they should be.

ECONOMIST: Cancer therapy