envelope (EN)

名词

名词 “envelope”

1. 信封
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   She wrote a letter to her friend, placed it in an envelope, and mailed it the next day.
2. 包围或封闭某物的层或覆盖物。
   The spacecraft heated up as it passed through the envelope of Earth's atmosphere during re-entry.
3. 装有气体的飞艇或热气球的气囊部分。
   They carefully folded the hot air balloon's envelope after landing.
4. （工程学）系统或设备的能力范围或性能极限。
   The new engine design extends the performance envelope of the car, allowing it to reach higher speeds safely.
5. （电子学）显示信号幅度随时间变化的曲线。
   The engineer studied the signal's envelope on the oscilloscope to diagnose the issue.
6. （音乐）声音的响度或音调从开始到结束随时间变化的方式。
   The musician adjusted the envelope of the synthesizer, altering how each note began and faded away.
7. （数学）与一族曲线或曲面中的每一个都相切的曲线或曲面。
   In calculus class, they learned how to find the envelope of a set of lines, which represents their common tangents.
8. （生物学）包裹器官、细胞或病毒的膜或层。
   The virus's outer envelope allows it to attach to and enter host cells.
9. （天文学）围绕恒星或彗星的气体云
   The comet's bright envelope became visible through the telescope as it approached the sun.
10. （计算机）添加到消息中的信息，有助于消息的传递，但不是消息本身的一部分。
    The email server reads the envelope of the message to determine where to deliver it.