Its reservoir with secondary porosity zone is also a key for petroleum pool formation, which is of distributary channel of fan delta front.

该构造储层属三角洲前缘亚相的水下分流河道微相沉积，并存在由成岩作用形成的次生孔隙发育带。

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There are flow separations at the front blade of bulge tip clearance. The high speed area of groove tip clearance increases the secondary flow loss dramatically.

凸型间隙在叶片前缘引起了流动分离，凹型间隙存在一高速区，增加了二次流损失。

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Successive positions of the wave front are then given by the envelopes of the secondary waves.

因此波前的相继位置即为次波的包络面。

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Moving around the device, all of the ports have remained the same and it still includes a stylus, but now there's a secondary front-facing 2MP video and stills camera for easier self-portraits (the rear shooter has also been upgraded to the same resolution).

ENGADGET: LeapFrog LeapPad 2 and Leapster GS Explorer hands-on (video)

The secondary, front-facing camera, meanwhile, has a 2-megapixel iteration of Sony's Exmor R sensor.

ENGADGET: Sony Xperia Z: hands-on with the new flagship at CES 2013 (video)

On the education front, our elementary schools, our secondary schools, have been slipping.

WHITEHOUSE: President Obama Holds a Town Hall in New Hampshire