They reflect a concentrated beam of light onto the town's central square, creating an area of sunlight roughly 600 square meters.

它们将一束集中的光线反射到城镇的中心广场上，形成面积大约为600平方米的阳光区域。

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In other words, ultrasound essentially travels in a very narrow beam — this makes it great for focusing the waves toward a desired area, but not for actual aural comprehension.

换言之，基本上超声波的传播声束极窄，这非常有利于将声波集中至指定地点，但对实际听力则无所助益。

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That means the beam produced is of higher quality than other lasers, is extremely straight (even by the exacting standards of a normal laser beam) and can thus be focused onto a small area.

(甚至符合正常激光束的严格标准)这样就能将能量集中传送到一个小的区域范围内。

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She is working on focusing the transmitted beam into a much smaller area, so that less energy is lost along its way.

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While the patient is still on the operating table, a lead disc is slipped behind the breast tissue to protect the chest cavity, and an eight inch wide electron beam focused directly on the area surrounding the tumour.

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That means the beam produced is of higher quality than other lasers, is extremely straight (even by the exacting standards of a normal laser beam) and can thus be focused onto a small area.

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