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1.balance n.平衡
Athletes need a good sense of balance.
运动员要有良好的平衡感。
2.ecosystem n.生态系统
They believed that the greater the diversity the more stable the ecosystem.
他们认为，生物多样性越丰富，生态系统就越稳定。
3.worldwide adj.全世界的
Worldwide sales reached 2.5 billion.
全球销售额达到了25亿。
4.pollution n.污染
Pollution can harm marine life.
污染会危及海洋生物。
5.Climate change and pollution also place shark survival at risk.
Climate change 气候变化
Climate change is still very much a subject for debate.
气候变化很大程度上仍是一个争论的话题。
We are all victims of climate change.
我们都是气候变化的受害者。
6.Climate change and pollution also place shark survival at risk.
at risk 处于危险中
He was putting himself at risk.
他在把自己置于危险境地。
Hundreds of thousands of people are at risk.
有几十万人正处于危险中。
