system for decreasing hydraulic reservoir air pressure to 在液壓系統中，將液壓油箱空氣壓力減至與周圍環境

ambient pressure.                                  壓力相同的活門。

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英漢對照民用航空詞典                                   BOEING

DESCENT, Phase of flight where altitude is decreasing. 下降，

                                                      飛機高度不斷降低的飛行階段。

DETAILED FLIGHT PLANNING, The calculation of fuel   詳細飛行計劃，

and required for a trip by considering each phase of 將航班中的每個階段（如爬升，巡航，下降，備降）都

flight (climb, cruise, descent, reserves).          列人考慮，來計算該航班所需要的燃油量。

DETECTOR, An electrical device for sensing normal or 探測器，

abnormal conditions.                                  用來感應情況之正常與否的電氣裝置。

DETENT SOLENOID, An electrical solenoid used for    鎖定電磁線圈，

controlling the engagement of the actuator output.    用于控制作動器輸出接通的電磁線圈。

DEVIATION, To change from a specified course or     偏差，

procedure.                                              與指定的航道或程序之差。

DIAPHRAGM, A flexible part for operating a valve    隔膜，

mechanism by pressure.                                用氣壓或液壓操作的活門機構中的柔性部件。

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DIELECTRIC, A material which does not conduct             電介質，

electricity and used between the plates of a capacitor      一種用于電容器板之間的不導電的材料。