| 单词 | R |
| 释义 | R /ahr/ v. Informal. are: Oysters R in season. 1. Chem. radical. 2. Math. ratio. 3. regular: a man's suit or coat size. 4. Elect. resistance. 5. restricted: a rating assigned to a motion picture by the Motion Picture Association of America indicating that children under the age of 17 will not be admitted unless accompanied by an adult. Cf. G (def. 7), PG, PG-13, X. [abbrev. for RESTRICTED] 6. Theat. stage right. 7. Physics. roentgen. 8. Chess. rook. Symbol. 1. the 18th in order or in a series, or, when I is omitted, the 17th. 2. (sometimes l.c.) the medieval Roman numeral for 80. Cf. Roman numerals. 3. Biochem. arginine. 4. Physics. See universal gas constant. 5. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office. |
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