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- At present basic theory and welding criterion of UPW are defective, research on welding mechanism and melt behavior of the welding region is not enough for the difficulty in study. 由于超聲波塑料焊接是涉及多學(xué)科的交叉學(xué)科，研究難度較大，目前超聲波塑料焊接的焊接基礎理論和工藝規范還比較欠缺，對超聲波塑料焊接機理和熔接行為研究不足。
- Most insect do not live in polar region. 大多數的昆蟲(chóng)不在極地地區生存。
- The earthquake may cause a region to fall in. 地震可以使一個(gè)地區下陷。
- Some metals weld better than others. 有些金屬容易焊，有的不容易焊。
- The oil-lamp needs a new globe, spherical lampshade. 這油燈需配個(gè)新的圓燈罩。
- Analysis of Cracking and Leak at Welding Region of a Liquefied Petroleum Gas Pipe 液化氣管線(xiàn)焊縫區開(kāi)裂泄漏原因分析
- Storms spring up easily in this region. 這個(gè)地區很容易發(fā)生風(fēng)暴。
- On reaching welding heat, the metal surfaces are pressed together. 當金屬表面達到焊接熱度時(shí)就會(huì )壓在一起。
- He is earning a salary in the region of25,000. 他當時(shí)的薪金在25,000英鎊左右。
- A storm that cut off power to the whole region. 切斷了整個(gè)地區電力供應的暴風(fēng)雨
- The Measuring and Analysis of the Temperature and Stress in the Weld Region of the Coke Tower Skirt 焦炭塔裙座焊縫區域溫度及應力的測試與分析
- Old World leek with a spherical bulb. 舊大陸的一種帶有球形莖的蔥。
- A planar region bounded by a circle. 圓形區，圓形空間被圓所包圍的一個(gè)平面區域
- Some of the students are welding capacitor; the others resistor. 學(xué)生中的一些人在焊接電容，另一些人在焊接電阻。
- A vineyard or wine-producing region in France. 克魯法國的葡萄園或葡萄酒生產(chǎn)區
- A bacterium having a spherical or spheroidal shape. 球菌球形或回轉扁橢球體形狀的細菌
- Food and fuel were scarce in this region. 這地區食物和燃料都很缺乏。
- There used to be a military base in the region. 這地區過(guò)去有個(gè)軍事基地。
- Some of the students are welding capacitors; the others resistors. 學(xué)生中的一些人在焊接電容，另一些人在焊接電阻。
- He is an authority in the region of chemistry. 他是化學(xué)界的權威。
