So, the echoes from a tree are going to a mass of chaotic acoustic reflections, not like the echo from a moth.

所以，树的回声会是一团混乱的声波反射，而不像飞蛾的回声那样。

youdao

As you get closer, the hue becomes a wriggling mass; a giant cap of insects on every tree, devouring the tiny leaves.

当你走近时，这团色彩开始变为慢慢移动的物体；每棵树上都覆盖了厚厚一层昆虫，在吞食着嫩叶。

youdao

The decision tree method is the effective method of detecting for concept describing space and the representative learning way in exampling learning of which specially dispose mass object.

决策树方法是发现概念描述空间的一种特别有效的方法，是实例学习中具有代表性的学习方法，专门用于处理大量对象。

youdao

He and his team studied tree mass, dead wood and soil carbon in twenty-five mangrove ecosystems in the Indian and Pacific Oceans.

VOA: special.2011.05.10

Another says ordinary lightning hits the ground or a tree and dislodges a glowing mass.

BBC: Ball lightning baffles scientists

For about a century now, tree planting has been the mass-participation activity.

BBC: NEWS | Science/Nature | Rolling back Iceland's big desert

Ghattas said that authorities remained hopeful the number of visitor bookings would recover so pilgrims could enjoy the city's planned events, which included a Christmas tree lighting ceremony on December 15, and a choral festival before midnight Mass on Christmas Eve.

CNN: Gaza conflict deters Bethlehem Christmas pilgrims