The power of the beam is concentrated on a single-ring structure and has an extremely strong radial intensity gradient.

理论分析和实验结果表明：光束的单环结构使光能量集中在一个环上，而环的边缘沿径向有极高的强度梯度。

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There clearly exists a strain intensity gradient and compression rate gradient within the country rocks so that both strain intensity and compression rate increase toward the contact surface.

热接触变质围岩内应变强度和压缩率向岩基接触面方向递增，存在较明显的应变强度梯度和压缩率梯度。

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There clearly exists a strain intensity gradient and compression rate gradient within the country rocks so that both strain intensity and compression rate increase toward the contact surface.

热接触变质围岩内应变强度和压缩率向岩基接触面方向递增，存在较明显的应变强度梯度和压缩率梯度。

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