He kept on sending me $ 20 every Christmas long after his debt was paid.
偿清了欠债之后,他长久以来一直在每个圣诞节寄给我20美元钱.
来源:词典精选例句VTOL aircraft is an under-actuated system with three degrees of freedom and two control inputs.
VTOL空间飞行器是具有三个自由度,两个控制输入的欠驱动系统.
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