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To predict helicopter vortex ring state boundary is necessary for flight safety.
直升机涡环状态边界的确定对直升机飞行安全具有重要意义。
youdao
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We crossed the state boundary at midnight.
我们在午夜穿过了州界。
youdao
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We crossed the state boundary at midnight.
我们在午夜走过了州界。
youdao
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We crossed the state boundary at midnight.
我们在午夜走过了州界。
youdao