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The reverse flow region is observable near the pipe wall.
管壁附近存在明显的回流再附区；
youdao
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The target is mounted on a support passing through the pipe wall.
标板装在穿过管壁的支撑上。
youdao
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The target is mounted on a support passing through the pipe wall.
标板装在穿过管壁的支撑上。
youdao