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It tires not nor does it boast of its power, but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help its passage evenwhen the wind is adverse.

这时虽有空气和水与运动着的鸟和船这样的物体之间的面接触，但与slide运动相比，可把这种面接触的摩擦力视为极小的数值，好象没有摩擦力一样。

It tires not nor does it boast of its power; but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help itspassage even when the wind is adverse.

它不知疲劳，也不夸耀自己的飞翔能力，然而它在空中十分自如，可以一直飞行6，000英里。飞向北方的筑有鸟巢的家乡以及从那里飞走，在飞行的过程中还要喂养已出窠的雏燕，甚至在顶风的时候也能够不费劲地穿过那似乎有助它迁栖的气流。

It tires not nor does it boast of its power; but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help its passage even when the wind is adverse.

燕子充分兼有这两类鸟的长处，它既不疲劳，也不炫耀自己的飞翔力；在空中十分自如，可以飞行6，000英里，可以飞往北方做窝的老家，再从老家飞回；一边飞一边喂养会飞的雏燕，甚至在顶风时也能在气流中滑翔，似乎气流在帮它前进。

It tires not, nor does it boast of its power; but belongs to the air, traveling it may be six thousand miles to and from it northern nesting home; feeding its flown young as it flies; and slipping through a medium that seems to help its passage even when the wind is adverse.

它既不疲劳，也不炫耀自己的飞翔力；在空中十分自如，可以飞行6000英里，可以飞往北方做窝的老家，再从老家飞回；一边飞一边喂养会飞的雏燕，甚至在顶风时也能在气流中滑翔，似乎气流在帮它前进。

It tires not, nor does it boast of its power; but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home, feeding its flown young as it flies, and slipping through a mediam that seems to help its passage even when the wind is reverse.

燕子充分兼有这两类鸟的长处，它既不疲劳，也不炫耀自己的飞翔力；在空中十分自如，可以飞行6，000英里，可以飞往北方做窝的老家，再从老家飞回；一边飞一边喂养会飞的雏燕，甚至在顶风时也能在气流中滑翔，似乎气流在帮它前进。

It tires not nor does it boast of its power; but belongs the air, travelling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help its passage even when the wind is adverse.

它即不疲倦也不炫耀它的力量，而是随着风飘，喂养飞行的幼鸟，檐子可能会离北方的巢穴六千英里远，而当风反向时，会滑行以帮助它自己通过。

"It tires not nor does it boast of its power; but belongs to the air, traveling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help its passage even when the wind is adverse."

它既不易感到疲劳也不自夸其飞翔力，但在空中能大显身手，往返于北方老窠飞行6000英里，一路上喂养刚会飞的雏燕，轻捷穿行于空气之中。即使遇上顶风，气流似乎也能助上一臂之力，使之飞越而过。

"It tires not nor does it boast of its power; but belongs to the air, traveling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slip ping through a medium that seems to help its passage even when the wind is adverse."

它既不易感到疲劳也不自夸其飞翔力，但在空中能大显身手，往返于北方老窠飞行6000英里，一路上喂养刚会飞的雏燕，轻捷穿行于空气之中。即使遇上顶风，气流似乎也能助上一臂之力，使之飞越而过。

It tires not nor does it boast of its power, but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home feeding its flown young as it flies and slip ...

glide 可以像slide那样持续地滑，但不一定像slide那样以面接触进行滑动。鸟在天空中翱翔，小船在水面荡漾，都可以用glide表示。

"It tires not nor does it boast of its power; but belongs to the air, traveling it may be six thousand mile s to and from its northern nesting home feeding its flown young as it flies and slipping through a medium that seems to help its passage even when the wind is adverse."

它既不易感到疲劳也不自夸其飞翔力，但在空中能大显身手，往返于北方老窠飞行6000英里，一路上喂养刚会飞的雏燕，轻捷穿行于空气之中。即使遇上顶风，气流似乎也能助上一臂之力，使之飞越而过。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。