The cargo ship took on extra ballast before leaving port in rough weather.

這艘貨輪在惡劣天候中離港前，額外加裝了壓艙物。

Our shipping manager confirmed that the vessel's ballast water meets new environmental rules.

我們的航運經理確認，這艘船的壓艙水符合新的環保規定。

The balloon tour operator explained that sand ballast is dropped to help passengers rise.

熱氣球旅遊業者說明，拋下沙袋壓載物能讓乘客升空。