trass
/træs/(亦作tarras)
noun
mass noun
- a light-coloured variety of volcanic ash resembling pozzolana, used in making water-resistant cement粗面凝灰岩, 火山灰(用来制作防水水泥)。
词源
late 18th cent.: from Dutch tras, German Trass, based on Latin terra 'earth'.
单词 | trass |
释义 | trass/træs/(亦作tarras) noun mass noun
词源 late 18th cent.: from Dutch tras, German Trass, based on Latin terra 'earth'. |
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