free tov.自由；免费freeadj.自由的；免费的；畅通的；没有…的；未使用的；空闲的；随意的v.释放；使自由；使摆脱；解除；使可用于(某目的)adv.免费地；自由地free trade policy自由贸易政策free format field自由格式字段free transit zone自由过境区,自由转口区freezing pressure冻结压力free air pressure自由空气压力free air capacity大气排气量,自由排气能力free medical care免费医疗free vortex sheet自由涡流面free infiltration自由渗入freeing the minds解放思想

1. Machinery casings may, however, be exposed if there are no openings giving direct access from the freeboard deck to the machinery space.
   然而，如果没有提供从干舷甲板到机舱的直接通道，那么机舱围壁应该是露天的。
2. The low freeboard and the shallow draught made the vessel vulnerable to swamping, and it would roll heavily on anything more than moderate waves.
   低干舷和浅吃水度让船只在湿沼地带很脆弱，它会在任何比一般海浪猛烈的海水条件下剧烈翻滚。