我用拇指指甲拧紧了灯上的螺丝。
他正在弄一架相机，用一个珠宝商用的小改锥拧紧顶盖的一个螺丝，这句话几乎是对着相机说的。
He was working on a camera, almost talking to it as he tightened a screw on its top with a jeweler's screwdriver.
松开罗架的底板螺丝，用增垫和去垫的方法调整两罗拉的中心高度，然后再拧紧螺丝。
Loose soleplate screw of the roller shelf, and adjust the central height of the two rollers by increasing or decreasing cushion, then tighten the screw.
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