考研Since carbon dioxide is present in the air only in trace quantities (3 to 4 parts in 10,000 parts of air) and water vapor is near saturation in the air spaces within the leaf (at 80℉, saturated air would contain about 186 parts of water vapor in 10, 000 parts of air), the total amount of water vapor lost is many times the carbon dioxide intake.
由于二氧化碳仅以微量(10000份空气中的3至4份)存在于空气中,并且水蒸气在叶片内的空气空间中接近饱和(80℉, 饱和空气在10000份空气中含有约186份水蒸气),水蒸气损失的总量是二氧化碳摄入量的许多倍。
1991年全国硕士研究生入学统一考试英语试题
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