abbr.sheep，Dall's sheep 野大白羊（产于北美西北部山区）
The Dall sheep range from Alaska to British Columbia.
多尔大角羊分布于从阿拉斯加到不列颠哥伦比亚一带.
The Dall flow tube is an empirical design with an extremely high pressure head recovery.
Dall流量管是具有特别高的压头补偿的实验装置.
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