他必须成为一名熟练的无线电操作员，能够修理自己的设备。

He must become a skilled radio operator and be able to repair his own equipment.

youdao

他必须成为一名熟练的无线电操作员，能够修理自己的设备。

He must become a skilled radio operator and be able to repair his own equipment.

youdao