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Your sinuses are hollow spaces inside the bones of your face and head. They open into the inside of your nose. You cannot see them from the outside, but you can feel them: when they fill up, your face and your voice sounds stuffed. There are several pairs, around the nose and the forehead. Doctors name them one by one; in ordinary talk the word almost always comes up because something hurts. People say “my sinuses are bad” when they have a cold or an allergy — though actually they may mean their whole nose feels blocked, not only those little caves in the bone.
鼻竇
原始詞典資料7 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
sinusnoun/ˈsaɪ.nəs/
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anatomybiologymedicineA pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
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anatomymedicinesciencesAn irregular venous or lymphatic cavity, reservoir, or dilated vessel.
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anatomymedicinephysiologyAn irregular venous or lymphatic cavity, reservoir, or dilated vessel.
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medicinepathologysciencesAn abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
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biologybotanynatural-sciencesA rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
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geographynatural-sciencesA bay of the sea; a recess in the shore.
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mathematicssciencestrigonometrySynonym of sine.
- So, in the helicopteron, as the helix is at the same time a sustaining plane, it should be likened to a surface moving horizontally, and in which, consequenty, the resistance to motion will be to the lifting power as the sinus is to the cosinus of the angle formed by such plane with the horizon.
- The variations are described in terms of cycles of sinuses and cosinuses.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。