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A biplane is an old kind of flying machine with two sets of wings, one above the other. Builders made most of them in the early 1900s, around the First World War. Two wings helped the plane lift when engines were still weak, but they also slowed it down, so later planes kept one set of wings and flew faster. You still see biplanes at air shows, in old war films, and sometimes flying low over farms to spray crops. People do not use this word for today’s usual passenger jets. It is a thing-word, not a feeling-word.
雙翼飛機
原始詞典資料4 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。
biplaneadj/ˈbaɪpleɪn/
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Composed of, or relating to, two planes (flat surfaces extending infinitely in all directions).
- biplane angiography
- The left apical 4-chamber image is used for one measurement and for a “biplane” estimate (that averages values from orthogonal planes), either the right parasternal long-axis image (the authors' preference) or the left apical 2-chamber view (shown here) is also measured. […] Either a biplane (Simpson) method of discs or a 3D volumetric rendering is used for LV volume measurements in human echocardiography laboratories.
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aeronauticsaerospaceaviationHaving, or consisting of, two superposed planes, aerocurves, etc.
- a biplane rudder
biplanenoun/ˈbaɪpleɪn/
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aeronauticsaerospaceaviationAn airplane that has two main wings, one above the other and supported by struts.
biplaneverb/ˈbaɪpleɪn/
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rareTo fly in a biplane.
- For an unforgettable experience, try llama trekking along a gentle trail in the White River National Forest, […] There also are sky-high balloon rides, biplaning, hang gliding, paragliding and plenty of wilderness paths for hiking.
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。