| 单词 | expand |
| 释义 | expand —expandable, expandible, adj. —expandability, expandibility, n. /ik spand"/, v.t. 1. to increase in extent, size, volume, scope, etc.: Heat expands most metals. He hopes to expand his company. 2. to spread or stretch out; unfold: A bird expands its wings. 3. to express in fuller form or greater detail; develop: to expand a short story into a novel. 4. Math. a. to write (a mathematical expression) so as to show the products of its factors. Cf. factor (def. 10). b. to rewrite (a mathematical expression) as a sum, product, etc., of terms of a particular kind: to expand a function in a power series. v.i. 5. to increase or grow in extent, bulk, scope, etc.: Most metals expand with heat. The mind expands with experience. 6. to spread out; unfold; develop: The buds had not yet expanded. 7. to express something more fully or in greater detail (usually fol. by on or upon): to expand on a statement. [1400-50; late ME expanden < L expandere to spread out, equiv. to ex- EX-1 + pandere to extend, stretch] Syn. 1. extend, swell, enlarge. See increase. EXPAND, DILATE, DISTEND, INFLATE imply becoming larger and filling more space. TO EXPAND is to spread out, usually in every direction: to expand one's chest. TO DILATE is esp. to increase the width or circumference, and applies to space enclosed within confines or to hollow bodies: to dilate the pupils of the eyes. TO DISTEND is to stretch, often beyond the point of natural expansion: to distend an artery. TO INFLATE is to blow out or swell a hollow body with air or gas: to inflate a balloon. |
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