根据河流宽度，穿越管道可能很长，需要多根管段。
This string of pipe may be very long, depending on the width of the crossing.
本文采用多根细丝线附在带电导体上的方法，来演示电场线。
The method of solving electrostatic field with electric field line;
我现在到了多瑙森根，这里是多瑙河的源头。
根尼特科尔多瓦说她当时甚至觉得图片不是真的。
Gennette Cordova said she did not even think the photo was real.
树老根多，人老话多。
树老根多，人老话多。
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