Scientists use "hole" as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.
科学家们用“空洞”一词表示臭氧浓度低于220个多布森单位（多布森单位是用来度量大气中臭氧柱尺度的单位。
To change to a different unit, choose your preferred units from the drop-down menu on the right, as illustrated in Figure 10.
若要更改为不同的单位，请从右侧的下拉菜单中选择首选的单位，如图10所示。
In September, while the industry overall suffered a 22% sales drop in a post-Cash for Clunkers hangover, Hyundai managed to increase its new-vehicle tally by 27% to 31, 511 units.
9月，当在后旧车换现金方面，工业销售额惨遭22%全面下跌时，现代却设法使自己的新车销量增加27%到31511辆。
Henrik Kallberg of the Karolinska Institute in Stockholm said his research showed consuming three or more units was associated with a 50 percent drop in the risk in developing rheumatoid arthritis.
斯德哥尔摩karolinska研究所的Henrik Kallberg说到他的研究发现每周饮三个单位或者更多的酒可以使发生类风湿性关节炎的危险降低50%。
As important protection equipment of hydro generator units and steel penstock, the water intake rapid-drop gate of the generator unit plays an important role.
作为水轮发电机组和压力钢管的重要保护设备，机组进水口快速工作门起着至关重要的作用。
As important protection equipment of hydro generator units and steel penstock, the water intake rapid-drop gate of the generator unit plays an important role.
作为水轮发电机组和压力钢管的重要保护设备，机组进水口快速工作门起着至关重要的作用。
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