It is the first time that the reproduction of this kind of migratory bird has ever been recorded.
It is the first time that the reproduction of this kind of migratory bird has ever been recorded.
这种候鸟的繁殖成功的记录，在杭州尚属首次。
It is the first time that the reproduction of this kind of migratory bird has ever been recorded.
这种候鸟的繁殖成功的记录，在杭州尚属首次。