目前尚不知道不同的乙肝病毒基因类型或变异类型导致肝癌(也被称作肝细胞癌)发生率的程度。
It was not known the extent to which different HBV genotypes or mutations are associated with the risk for liver cancer, which is also called hepatocellular carcinoma.
报道说，飞机是在吉林省洮南合同战术训练基地上空飞行期间坠毁的，目前尚不知道机上的两名飞行员是否逃生。
It reported that the plane had crashed during the flight above the combined tactical training base at Taonan in Jilin Province, flight is not yet know whether the two pilots have escaped to the crash.
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