Nelson Mandela University's study used data from ship identification tools to estimate underwater noise from passing ships.

纳尔逊·曼德拉大学的研究使用了来自船只识别工具的数据来估计过往船只产生的水下噪音。

We're campaigning against this because, although there'll be little pollution from oil, exploration creates a lot of underwater noise.

我们正在举行活动抗议该公司的这项举措，因为，虽然石油本身并没有多少污染，但是开采活动会在水下制造很多噪音。

Much of the underwater noise a ship produces comes from its propeller.

船舶产生的大部分水下噪音都来自螺旋桨。

Also, more vessels mean increased risks to Arctic ecosystems and wildlife, from heavy fuel oil spills to air and underwater noise pollution and the break-up of the remaining ice.

另外，更多的船只意味着北极生态系统和野生动物面临的风险增加，从重油泄漏到空气和水下噪音的污染，以及剩余冰层的断裂。