Decision HEIGHT (DH) 2, an altitude used during a precision approach to trigger the decision of either landing or go-around.

决断高(DH) 2，精密进近时产生继续着陆还是复飞决定的高。

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In view of the unexpected study findings, a decision was taken to terminate the ALTITUDE study.

FORBES: ALTITUDE Study of Aliskiren Terminated Early by Novartis