短文改错
下面是一段短文，请你对其进行修改。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意： 1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第11处起）不计分。
A gathering of more than 700 oriental storks(东方白鹳)was recorded at Naolihe National Nature Reserve in Heilongjiang Province last month. Such a big gathering has been seen before in the reserve. The researchers had often recorded only about 150 in the past autumns. Now the population of the large white birds for black wing feathers and long legs are estimated at 3.000 in the world. It is certain a sign that the reserve’s conservation is better now and before. The reserve is considered it as one of the most important stopover site for oriental storks. The storks winter in it and the researchers will keep a eye on the birds until you fly away.