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| 51. | Heat as a physical quantity must be measured in terms of a definite unit. |
| 热作为一个物理量，必须用一定的单位来测量。 |
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| 52. | a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation. |
| 公制长度单位等于一亿分之一厘米（或（待查表）微米；用来测量电磁辐射波长的单位。 |
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| 53. | a measure of the potential energy of a unit charge at a give point in a circuit relative to a reference point (ground). |
| 测量电路中给定点的单位电荷相对于某个参照点（地面）的势能的单位。 |
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| 54. | A unit of atmospheric pressure that is equal to the pressure exerted by a one-inch column of mercury at the earth's surface at a temperature of0=C. |
| 气压测量单位气压单位，一大气压相当于地面温度为0＝C时的一英寸水银柱的压力 |
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| 55. | A unit of area equal to10-24 square centimeter, used to measure collision cross sections. |
| 靶（恩）面积单位，等于10－24平方厘米，用作测量碰撞截面 |
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| 56. | a decimal unit of measurement based on meters and kilograms and seconds. |
| 以米公斤和秒为基础的十进制测量单位。 |
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| 57. | (formerly)unit of length (66 feet)for measuring land |
| （旧时）测链（测量土地的长度单位,等于66 英尺）. |
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| 58. | The metric system is the measuring system based on the meter for length, the gram for weight and the liter for capacity, which counts by tens. |
| 公制是基于以米为长度单位，克为重量单位，公升为容积单位的测量系统，它们都是十进位。 |
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| 59. | An instrument for measuring in watts the power flowing in a circuit. |
| 瓦特计以瓦特为单位测量电路中功率的仪器 |
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| 60. | One used to represent a unit of measurement, such as feet or minutes in latitude and longitude. |
| 用来代表衡量单位用来代表某一测量单位，如经度或纬度上的英尺或分 |
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