For unknown reasons, autism is four times more likely to occur in boys than in girls.

自闭症的发病率男孩较高，是女孩的四倍，原因不明。

youdao

For unknown reasons, the herpes drug acyclovir lowers the level of AIDSvirus in the blood.

由于一些未知原因，治疗疱疹的药物阿昔洛韦(acyclovir)仍然能够降低艾滋病病毒在血液中的含量。

youdao

Running can be, although for unknown reasons, it doesn’t seem to stimulate bone building in some people.

但跑步可以做到，尽管由于某些未知原因，在某些人身上，这还不能刺激骨骼的成型。

youdao

That means 19 out of 20 people who have acute pancreatitis for unknown reasons will never have it again.

CNN: What could be causing my pancreatitis?

However, for unknown reasons, the Iraqi government did not complain when CNN broadcast footage from Arab TV networks, he said.

CNN: executive: Iraq targeted network's journalists

Calcium channel blockers have become the preferred first medical treatment for cramping in patients who get them often for unknown reasons.

CNN: What causes leg cramps?