And, some people suffer from unusual medical conditions.

有些人患有不同寻常的疾病。

The Iranian official says no radio message of " unusual condition" has been received from the pilot.

伊朗官员说，没有从飞行员那里收到“异常情况”的无线电消息。

Now, one afternoon, this return trip was made under unusual conditions.

现在，一天下午，这次返程是在不寻常的情况下进行的。