| 单词 | tristeza | 
| 释义 | tristezanoun  tris·te·za  tri-ˈstā-zə    : a highly infectious disease of citrus trees grafted on sour orange rootstocks that is caused by a single-stranded RNA virus (species Citrus tristeza virus of the genus Closterovirus, family Closteroviridae) transmitted by aphids and that eventually causes death of the trees   | 
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