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研究开发
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DEFINITIVE EXAMPLES 权威例句〔cautious〕Companies seem cautious about investing(=are unwilling to invest) money in research and development.公司在研究开发方面的投资似乎比较谨慎。麦克米伦高阶
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in spots
in spots
in spurts
in stages
in state
in state
in state
in station
in station
in statu quo
in statu quo ante
in status pupillari
in stays
in stead of
in step
in step
in step
in stereo
in stereo
in stitches
in stitches
in stitches
in stock
in stock
in stock
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更新时间：2026/8/22 0:19:13