We crossed the state boundary at midnight.
我们在午夜穿过了州界。
We crossed the state boundary at midnight.
我们在午夜走过了州界。
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。
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。
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