... offse 释义：抵消,补偿,偏离 off-centre beam 释义：偏离中心束 departure 释义：偏差,偏离,违背 ...
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The other two methods rely on specially shaped laser beams - instead of a beam whose intensity peaks at its centre and tails off gradually, the team is investigating two alternatives: solenoid beams and Bessel beams.
BBC: Nasa examines 'tractor beams' for sample gathering
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