In daily life, cars and planes are common means of transportation, but in some cities, boats are used more, and there are various types of boats, and different types of use are different.

According to the hull materials, there are wooden ships, steel ships, cement ships and glass fiber reinforced plastic ships; According to the propulsion method, there are paddle steamers, propeller boats, horizontal propeller boats and sail-assisted boats, etc.; according to the navigation method, there are self-propelled ships and non-self-propelled ships; according to the approaching state, there are displacement ships and non-displacement ships.The classification of civil ships is usually divided by purpose. Due to different classification methods, the same ship may have different names.

According to different purposes, it can be divided into: passenger and cargo ships; general cargo ships; container ships, ro-ro ships, barges; bulk grain ships, coal ships, dual-purpose ships; dual-use ships (ore/oil tanker, ore/bulk carrier/oil tanker) Special cargo ships (wood carriers, reefer ships, car carriers, etc.); oil tankers, liquefied gas carriers, liquid chemical carriers, timber carriers, reefer ships, salvage ships, salvage ships, icebreakers, cable laying ships, scientific research ships and fishing ships Wait.

Not only food has a shelf life, but even a boat has a useful life. According to the time of use, it can be divided into the following categories:(1) High-speed passenger ships with an age of more than 10 years are classified as Class I old sea-going ships;(2) Ro-ro passenger ships, passenger and cargo ships, passenger ferries, passenger and cargo ferries (including passenger train ferries), tourist ships, and passenger ships with a ship age of more than 10 years are Class II old sea-going ships;(3) Oil tankers (including asphalt tankers), bulk chemical tankers, and liquefied gas tankers over 12 years of age are three types of old sea-going ships;(4) Bulk carriers and ore carriers with an age of more than 18 years are four types of old sea-going ships;(5) Ro-ro cargo ships, bulk cement ships, reefer ships, general cargo ships, multi-purpose ships, container ships, timber ships, tugboats, pushers, barges, etc., which are over 20 years old, are five types of old sea-going ships.

Some people enjoy the time on the boat, but it is a painful experience for some people, such as seasick people. When seasickness occurs, the following three methods can alleviate it:

1. When seasickness occurs, It is recommended to come out and blow the sea breeze, look ahead, and be sure to stand in front of the yacht, not against the yacht to stand behind.

2. You can also eat some foods like ginger slices and lemons, or apply a little wind oil essence on the temples. The wind oil essence has a refreshing effect and can relieve the dizziness and headache caused by seasickness.

3.You can use relaxation therapy, such as chatting, listening to music, and massage, which is also helpful for seasickness. For people who often go out to sea or take a boat, if they vomit repeatedly, they should go for seasickness training, such as swinging, swimming, and cradle or spinning. After training, the adaptability of the vestibule and cerebellum to postural changes and the ability to resist dizziness can be improved;