certificate of date of sailing

例句：

1. 1. The ship's certificate of date of sailing is valid for one year.
   该船的航行日期证书有效期为一年。
2. 2.The captain signed the certificate of date of sailing before leaving port.
   船长在离开港口前签署了航行日期证书。
3. 3. The crew members were required to complete a training course before they could sail on the new vessel.
   船员们需要在新船上进行培训，才能开始航行。