| 单词 | graduated series |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔metallophone〕A percussion instrument consisting of a graduated series of metal bars struck with either hand-held or keyboard-controlled hammers.马泰勒琴：一种由一系列分级排列的金属条组成的打击乐器，用手执的或键盘控制的槌敲击发出声音美国传统 |
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