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重点讲解：
1. invest in 投资；
It pays to invest in protective clothing.
在防护服上投资是值得的。
2. be ready to do sth. 准备好的；胜任的；
You must be ready to leave at a moment's notice.
你必须随时准备出发。
3. because of 因为；由于；
We have had to raise our prices because of rising costs.
因为成本日益上涨，我们不得不提高价格。
4. ahead of 早于；在…之前；
Trading was very light ahead of yesterday's auction.
昨天拍卖之前的成交量很小。
n. 观察，观察力，评论
adj. 被设计用来
