More mature drag reduction tools have been developed abroad, but the domestic drag reduction tool research and development is still in its infancy.
国外已有较为成熟的减阻工具，而国内的减阻工具研发工作尚处于起步阶段。
More mature drag reduction tools have been developed abroad, but the domestic drag reduction tool research and development is still in its infancy.
国外已有较为成熟的减阻工具，而国内的减阻工具研发工作尚处于起步阶段。
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