If the optical head is on track, then the primary beam will be centered on a track (with pits and bumps) and the two secondary beams will be centered on land.

如果光学头在轨道上，主激光束将处于轨道中心，两个副光束处于轨道之间。

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The SIMS technique bombards the lunar samples with a primary ion beam that allows the researchers to separate the ions with a magnet, depending on the charge.

SIMS技术可以以离子束轰击月岩样本，从而使研究人员调整电荷水平，用磁石分离出离子。

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Their primary weapon was a lightsaber pike with a red beam extending from the tip of the weapon.

他们的主要武器是一支光剑矛并于矛的顶端有一支延伸的红色光束。

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John McCain, the answer has been to pretty much ignore Iowa, and focus like a laser beam on the first primary state of New Hampshire.

CNN: Candy Crowley/