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1.cyberspace：n. 网络空间

She travels in cyberspace by sending messages to friends around the world.（她利用电子空间给世界各地的朋友们发送信件。）

2.cyclical：a. 循环的，周期

The recycling industry is particularly vulnerable to wildcyclical swings in the market.（回收工业经受不了市场价格的同期性激烈涨落。）

以毒攻毒
to set a thief to catch a thief

以怨报德
He is a person who bites the hand that feeds one.

以逸待劳
To wait at ease till the enemy is exhausted.

以寡敌众
to fight against longer odds

以德报怨
I think it is better for you to render/return good for evil .