but they are using side channels. It is extremely interesting. 但实际上它们经常会游进支流中 特别有意思

301. So one of the dolphins actually went about 46km upstream
     一只河豚从放生处逆流而上46公里之远
302. from the release site, and the other thing is that we thought
     还有一个新发现就是
303. that they will stay in the main river stream,
     我们本以为河豚会留在河流干流
304. but they are using side channels. It is extremely interesting.
     但实际上它们经常会游进支流中 特别有意思
305. Tracking the movement of the tagged dolphins
     追踪受标记河豚的动向
306. will help Uzma better understand
     将帮助乌兹玛更好的了解
307. when and where they become trapped...
     它们被困的时间与地点

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 304 行