1.pebble n.卵石；水晶；水晶透镜

Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.
快乐就像是一块被丢进池塘的卵石泛起阵阵涟漪。

Sometimes it takes but a single pebble to start an avalanche.
有时候只要一颗石子就能触发一场雪崩。

2.orchard n.果园；果园里的全部果树

His body was buried at the foot of the orchard.
他被葬在果园的一个角落里。

This is a pomegranate and orange orchard.
这是一个种植石榴和桔子的果园。

3.artillery n.炮，大炮；炮兵部队

He had seen israeli artillery fire white phosphorus shells at gaza city, garlasco said.
他曾亲眼见到以色列炮兵向加沙城发射白磷弹，garlasco说。

During battle, forward observers identify targets and direct artillery, mortar and aviation fire.
在战争中，前锋探测队员识别各种目标，并指导炮兵部队、发射器与空军部队的开火。

4.ammunition n.弹药，军火

The federal reserve was running out of monetary ammunition.
美联储正在慢慢耗尽它的货币弹药。

Sceptics have plenty of ammunition.
怀疑者有大量的可以用来攻击的炮弹。