Nuclear submarines are able to provide their own infinite supply of air, water and power. Their only limitation for staying submerged is the amount of food on board.
核潜艇可以无限止地供应空气，水和动力，唯一对潜水时间有限制的是艇上的食品储量。
The only thing to really note here is that you need to supply a title, body, and author for each message on the message board.
这里需要特别注意的一点是：需要为留言板上的每个消息提供标题、主体和作者。
Providing an on-board power supply is difficult, however, so he is investigating the use of external magnetic fields to power the device.
然而，倘若板载动力装置很难实现的话，他正在研究利用外部磁场给器件提供动力的途径。
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