病因

bìng yīn réng wèi chá míng

病因仍未查明。

The cause of the disease has yet to be determined.

bìng yīn bù xiáng

病因不详。

The cause of the disease is unknown.

bìng yīn réng wú fǎ què dìng

病因仍无法确定。

The cause of the disease is still in doubt.

zhēn duì bìng yīn jìn xíng de diào chá

针对病因进行的调查

investigation into the cause of disease

zhǎo bìng yīn

找病因

look for the cause of disease

chōu yān shì yǐn qǐ ruò gān zhǒng zhǔ yào jí bìng de bìng yīn

抽烟是引起若干种主要疾病的病因。

Smoking is a causative factor in several major diseases.

yī shēng nán yǐ pàn dìng tā de què qiè bìng yīn

医生难以判定她的确切病因。

Doctors found it hard to establish the precise nature of her illness.

tā men zhèng jì huà kāi zhǎn yán jiū zhè zhǒng jí bìng de yí chuán bìng yīn

他们正计划开展研究这种疾病的遗传病因。

They are planning to undertake research into the genetic causes of the disease.