elongation
/ˌiːlɒŋˈgeɪʃən/noun
mass noun
1- the lengthening of something拉长, 延长, 延伸。
1.1
- a part of a line formed by lengthening; a continuation延长线, 延长部分。
1.2
- the amount of extension of an object under stress, usually expressed as a percentage of the original length延伸率。
1.3
- Astronomy the angular separation of a planet from the sun or of a satellite from a planet, as seen by an observer【天文】距角; 大距。
词源
late Middle English: from late Latin elongatio（n-）, from elongare 'place at a distance' （see ELONGATE）.