In 2003 however, the monitoring work became more systematic with some 4,000 7,000 blood and swab samples collected from wild birds.是什么意思_In 2003 however, the monitoring work became more systematic with some 4,000 7,000 blood and swab samples collected from wild birds.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句