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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 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。

The swallow shares the virtues of both schools in highest measure. 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 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。

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 we no longer take omens from their flight on this side and that; and even the most superstitious villagers no longer take off their hats to the magpie and wish it good-morning.

这些鸟对我们是有益的，虽然我们不再从它们的飞翔姿态来占卜吉凶，连最迷信的村民也不再对喜鹊脱帽行礼，祝它早安了。英文文字+中文朗读：快速内容熟悉，单词记忆、语法熟练等。

Medium 的含义是"介质",没有这种"介质"便达不到一定的目的 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。

The metal mold design now adopt a form of one mole but six cayities ,this way can improve the efficiency;the mold's joint face is the ball's neutral plane,that makes the mold opened convenient;In the gating,the runner and the riser is the same ,and this design adopt scum riser,that make sure a better routing and make sure the casting's feeding;the mold use gravity to lockwasher itself;the core's material is quartz sand,and spread high tempearature resistant dope on it;In the design, same taper in the guide bush of the core box is needed to make sure open the mold easily;The insert blocks of the core box are made by numercial control processing,this way reduce the cost of production; the scale division positioner make sure the same specification has better interchangeability,also,as all the machining can be finished on the general machine tool,it make the cost low,so it can be spreaded abundant in the medium and minor enterprise;when workout the mold's processing technology,this design adopt the rough's two end plane as benchmark,the ball cavities are machined by scale division positioner;then use Autocad,Pro/e to draw planar and three dimension blueprint,use Pro/e to make three-dimensional animation.

本次设计的群铸模具采用一模六腔形式，生产效率高；模具分型面选择磨球的中性面，使得分模方便；浇注系统采用浇冒口一体形式和集渣包设计，保证了良好的加工工艺和补缩；锁模方式为重力锁模；砂芯采用石英砂，并在表层涂以耐高温涂料；芯盒导套选择一定的锥度，使取模容易；芯盒镶块运用数控加工，降低了生产成本；分度胎具保证了同种规格模具具有良好的互换性，而且因为所有加工基本都可以在普通机床上完成，生产成本低，可以为中小型企业普遍采用；在加工工艺编制过程中，采用两端面互为基准，球腔用专业夹具加工；Autocad，Pro/e分别制作了模具的二维和三维立体图，并运用Pro/e制作了三维动画演示。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。