frastrated怎么读音，Fra怎么读

frass怎么读，frass什么意思，frass短语和例句

frass怎么读，frass什么意思

英 [fræs]美 [fræs]

• n. 幼虫的粪便；蛀屑

frass 常用句子

1.Field tests showed that females gnawed significantly fewer oviposition scars on Pinus massoniana trees treated with hexane extracts of larval frass than on the control trees.

林间驱避试验结果说明，幼虫虫粪的己烷提取物处理过的树干上的刻槽数明显少于对照树干上的刻槽数，二者具有极显著差异；

2.Field tests showed that females gnawed significantly fewer oviposition scars on Pinus massoniana trees treated with hexane extracts of larval frass than on the control trees.

林间驱避试验结果说明，幼虫虫粪的己烷提取物处理过的树干上的刻槽数明显少于对照树干上的刻槽数，二者具有极显著差异；

3.Frass of longhorned beetle larvae plays an important role in natural enemies searching for their cerambycid hosts.

天牛幼虫排出的虫粪所释放的挥发性物质成为天敌搜寻天牛所在微栖境的重要化学信息物质。

4.The number of emergence holes and frass holes in weeping willows on both Banks of Qinhuai river are investigated.

调查了外秦淮河两岸垂柳上光肩星天牛羽化孔、排粪孔的分布情况。

5.Frass of long-horned beetle larvae plays an important role in natural enemies searching for their cerambycid hosts.

长角甲虫幼虫的部分在寻找天敌的天敌中起着重要的作用。