| 单词 | 含水量 |
| 释义 | 〔perlite〕A natural volcanic glass similar to obsidian but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form perlite is used as a lightweight aggregate, in fire-resistant insulation, and in soil for potted plants.珍珠岩：一种天然火山玻璃岩，类似于黑曜岩，但它有清晰的同轴裂纹和相对高的含水量。轻的热膨胀形珍珠岩可用作轻型建材，也可用于绝热材料和盆栽植物的土壤中〔psychrometer〕An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.干湿表，湿度计：一种测量空气中含水量或相对湿度的仪器，通过两支温度计（一支为湿管另一支为干管）的读数差得出结果 |
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