“hourglass”的概念、定义、翻译、参考文献-科学参考

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单词	hourglass
释义	hourglass 沙漏
随便看	self-propelled scraper self-propelled ship self-propelled single-row harvester-thrasher self-propelled single-row harvestor self-propelled sprayer self-propelled three-row rotary cultivator self-propelled tool carrier self-propelled tool chassis self-propelled tracked loader self-propelled underwater missile self-propelled wagon drill self-propelled water barge self-propelling self-propelling dredger self-propelling landing gear self-propelling launcher self-propelling tripper self-properlled combine self-propulsion point self-protected transformer self-protecting self-protecting type pump self-protection arms self-protective transformer self-provided foreign exchange