Gōngchéngshī yòng jīguāng liángdù dàqiáo de wèiyí.
Engineers use lasers to measure the bridge's displacement.
Tips
mistakes
量 is a tone-changing character. In 量度 (measure) it's liáng (rising tone, the verb 'to measure'). In 重量 ('weight') it's liàng (falling tone, the noun 'quantity'). Picking the wrong tone here is a common slip even for advanced learners.
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More technical / formal than the everyday 测量. You'll see 量度 in physics, engineering and philosophical contexts (量度时间 = 'measure time').
