The bird which holds the world’s record for long-dis tance flying is the arctic tern, which you see in the picture. It builds its nest within seven and one-half degrees of the north pole, remaining but a brief period in the “land of the midnight sun,’’ when it flies away to the icebergs of the antarctic continent, a distance of 11,000 miles. Although thousands of these birds make this round trip every year, no one has yet been able to map the route by which they travel. For nearly half the year they are in flight.
n. 杆,柱,极点
v. (用杆)支撑