注释：① deposite vt. 放置，存储
例句：
1. I had to deposit 10% of the price of the house.
我必须先付房价的10%作定钱。
2. You may deposit your valuables in the hotel safe.
您可以将您的贵重物品放在旅馆的保险柜里。

② flush n. 激动，洋溢；面红；萌芽；旺盛；奔流
vt. 使齐平；发红，使发亮；用水冲洗；使激动
vi. 发红，脸红；奔涌；被冲洗
adj. 大量的；齐平的；丰足的，洋溢的；挥霍的
例句：
1. She shows a flush of joy at his coming.
对他的到来她表现出一阵兴奋。
2. Rivers flush with the spring rains.
因春雨而上涨的河水

③ assault n. 攻击；袭击
vt. 攻击；袭击
vi. 袭击；动武
例句：
1. After the assault was successful, the last four guards had surrendered.
袭击得手之后，最后四个卫兵投降了。
2. The commander decided to assault the enemy in the darkness.
指挥官决定夜袭敌军。

句子讲解：

1. They spewed out thick clouds of hot air, ash and volcanic rock which settled on the ground.

【结构简析】句中的"which"从句是一个定语从句，修饰前面的volcanic rock。

【参考译文】火山喷射出的热空气、火山灰散布在空气中还有地面上厚厚一层的火山岩。

2. This also confirmed the theory geologists had about the formation of Wind River Canyon, the incredible amount of infield buried the Owl Creek Mountains.

【结构简析】"geologists had about the formation of Wind River Canyon"在句中用来说明"theory" ,省略了关系词"that"，"buried"过去分词来修饰"infield"。

【参考译文】这也证实了地质学家关于形成风河峡谷的猜想，大量的耕地埋葬了猫头鹰溪山脉，这个数量令人难以置信。