ultrasound cleaner 超声波清洗器

unisex 不分男女的

Up-down adjusting range of the spotting 支架升降范围

up-to-date products 最新产品 

using polycarbonate lenses; the lightest, most impact-resistant material 使用聚碳酸酯，最轻最抗震的材料

UV 即ultra violet紫外线 

vision 视力

visual acuity test视力检查

visual field 视野

visual test视力检查

visual test equipment 验眼设备

Wearing sunglasses戴太阳眼镜

wearing glasses 戴眼镜

With adjustment of Elasticity and installation of random spacing to go with focusing system带有松紧调节及随机限位装置

wood frame 木框

Working distance 工作距离

Working stage 载物台