Carefully fill two sampling bottles completely with stream water.
小心地把两个取样瓶以溪水完全装满。
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Carefully fill two sampling bottles completely with stream water. Use the dissolved oxygen meter to measure dissolved oxygen in the water.
小心地把两个取样瓶以溪水完全装满。以溶氧量计测量水中的溶解氧量。
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