Approval, permission (see clear, v. 11c); spec. permission (from the control-tower) to land or take off in an aircraft. Originally U.S.
| 单词 | θ207310 |
| 释义 | society > travel > air or space travel > regulation and control of flying > [noun] > permission to land or take off (1) clearance1944 Approval, permission (see clear, v. 11c); spec. permission (from the control-tower) to land or take off in an aircraft. Originally U.S. |
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