![](https://www.ebk.net.cn/tikuimages/2/2017/500/shoutiniao71/67829605a192126400f22a5e79b749f4.png)
如图,从气球\(A\)上测得正前方的河流的两岸\(B\),\(C\)的俯角分别为\(67^{\circ}\),\(30^{\circ}\),此时气球的高是\(46m\),则河流的宽度\(BC\)约等于 ______ \(m.(\)用四舍五入法将结果精确到个位\(.\)参考数据:\(\sin 67^{\circ}≈0.92\),\(\cos 67^{\circ}≈0.39\),\(\sin 37^{\circ}≈0.60\),\(\cos 37^{\circ}≈0.80\),\( \sqrt {3}≈1.73)\)