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1.The Mig-21 fighter jet is a popular choice for military aircraft.
米格-21战斗机是军用飞机的热门选择。
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2. The Mig-21 has been upgraded with new radar systems to improve its combat capabilities.
米格-21已经升级了新的雷达系统，以增强其战斗能力。
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3.The Mig-21 is known for its speed and maneuverability in the air.
米格-21以其在空中的速度和机动性而闻名。