1. From the characteristics such as, fairly long and crossed primary-projections, washed eye-stripe, slightly forked tail and rather dark legs, I suspect this warbler could be Willow Warbler Phylloscopus trochilus!
从这些特徵例如：相当长并且相交叉的初级飞羽突出处，淡淡的过眼线，轻微分叉的尾羽及相对暗色的脚，我怀疑这只柳莺是Willow Warbler。我想听听你的评论。