planar contracting flow 平面收缩流动
contracting flow and scouring sediment 束水攻沙
contracting-duct flow 收敛管道内的流动
contracting flow
收缩流
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Margins also appear to be contracting, while free cash flow is below the levels where it started the year.
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