倍频晶体选择了非线性系数相对较大、允许角相对较宽的LBO晶体。

With relative high secondary harmonic generation coefficient and wide acceptance Angle, LBO crystal is chosen as the most suitable secondary harmonic generation crystal for blue lasers.

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机长被允许飞越曼哈顿岛南角，我看到曾经的双子塔，现在变成了一个冒着浓烟的废墟。

The captain got permission to fly over what had been the site of the Twin Towers at the southern tip of Manhattan, now a smoking ruin.

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我们走过左边三角形的农场，路变宽了，可以允许我们并排走在一起。

We passed the triangular farm on our left and the path widened to allow us to walk together.

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