| 单词 | A |
| 释义 | A 1. n. (also a) (pl. As or A's) 1. the first letter of the alphabet. 2. Mus. the sixth note of the diatonic scale of C major. 3. the first hypothetical person or example. 4. the highest class or category (of roads, academic marks, etc.). 5. (usu. a) Algebra the first known quantity. 6. a human blood type of the ABO system. Phrases and idioms A1 1. Naut. a a first-class vessel in Lloyd's Register of Shipping. b first-class. 2. colloq. excellent, first-rate. A1, A2 , etc. the standard paper sizes, each half the previous one, e.g. A4 = 297 x 210 mm, A5 = 210 x 148 mm. from A to B from one place to another (a means of getting from A to B). from A to Z over the entire range, completely. 2. abbr. (also A.) 1. Brit. (of films) classified as suitable for an adult audience but not necessarily for children. Usage Now replaced by PG. 2. = A LEVEL. 3. ampere(s). 4. answer. 5. Associate of. 6. atomic (energy etc.). |
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