这些无人飞行器中包括改进的无人飞行器米格-21和称之为L-29的飞机。

This effort has included attempts to modify for unmanned flight the MiG-21 (ph) and with greater success an aircraft called the L-29 (ph).

youdao

这些无人飞行器中包括改进的无人飞行器米格-21和称之为L-29的飞机。

This effort has included attempts to modify for unmanned flight the MiG-21 (ph) and with greater success an aircraft called the L-29 (ph).

youdao