| 词汇 | jam |
| 词根词缀 | 词源： 1. jam (v.) "to press tightly," also "to become wedged," 1706, of unknown origin, perhaps a variant of champ (v.). Sense of "to cause interference in radio signals" is from 1914. Jazz noun meaning "short, free improvised passage performed by the whole band" dates from 1929, and yielded jam session (1933); perhaps from jam (n.) in sense of "something sweet, something excellent." Noun sense of "machine blockage" is from 1890, which probably led to the colloquial meaning "predicament," first recorded 1914. 2. jam (n.) "fruit preserve," 1730s, probably a special use of jam (v.) with a sense of "crush fruit into a preserve." 词根记忆： n. 阻塞,轧住;果酱v.(使)阻塞,(使)轧住不动In the bar the barber bargained for a jar of jam, then got over the barrier of barrels.在酒巴里理发师为一罐果酱讲了价然后越过桶作的屏障. |
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