And changes to ship machinery have proven effective at increasing fuel efficiency while reducing noise.

事实证明，船舶机械的改变可以有效提高燃油效率，同时降低噪音。

(4) Whenever the ship machinery operation may be affected by weather or other condition changes, such as shallow water approach, concentration of marine life or seaweed, ice in water, or change of trim or draft due to ballasting shifting?

(4) 何时船舶机械操作可能受到天气或其他条件变化的影响，例如浅水接近、海洋生物或海藻集中、水中结冰、或因压载转移而导致纵倾或吃水变化？