moisture
noun [ U ] uk/ˈmɔɪs.tʃər/ us/ˈmɔɪs.tʃɚ/
潮气，湿气;水分
a liquid such as water in the form of very small drops, either in the air, in a substance, or on a surface
These plants need a rich soil that retains moisture. 这些植物需要一种能保持水分、养分充足的土壤。