The contracting parties shall conduct cooperation to crack down on illegal immigration, including the crack down on illegal transportation of natural persons via its territory.

缔约双方将合作打击非法移民，包括打击通过本国领土非法运送自然人的行为。

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The natural frequencies of beam are calculated with finite element method in the cases of different crack width and different crack depth.

本文利用有限元法分别计算在不同的裂纹深度、不同的裂纹开口宽度的情况下梁的固有频率。

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The results show that the fatigue crack not only decreases the natural frequency, but also causes non linear vibration.

计算结果表明，疲劳裂纹不仅使悬臂梁的固有频率下降，而且引起非线性强迫振动响应。

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Many federal and state regulators say hydraulic fracturing, which injects a mix of water and chemicals thousands of feet underground to crack open shale and release natural gas, is safe when done properly and thousands of sites have few complaints of pollution.

NPR: AP: NY Fracking Held As Cuomo, RFK Jr. Talk Health

Cuomo said late Monday that he hasn't given a deadline for the state health and environmental conservation commissioners he appointed to advise him on a decision on whether to drill for gas using hydraulic fracturing, or fracking, which injects a mix of water and chemicals thousands of feet underground to crack open shale and release natural gas.

WSJ: NY senators seek fracking delay to await key study

Fracking uses high-pressure mixtures of water, sand or gravel and chemicals to crack rock formations and release oil and natural gas deep underground.

NPR: Scenic, Struggling S. Illinois Braces For Oil Rush