他们又启动了两台主冷却泵。
头发一丝不乱的地方电视台主播充当司仪。
A local television anchor his hair perfectly in place serves as master of ceremonies.
采用浇注型聚氨酯材料，设计了一种管道用胀环试样试验台主密封圈。
Manufactured by casting polyurethane, main seal ring used in expansion ring testing device for pipeline was designed.
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