They're limited in use because they require support vessels (e.g., Tenders) to operate, and also have a short submerged operational period due to their energy and supply replenishment needs.
minisubmarines
The U.S. Navy's Alvin (DSV-2) is not a mini-submarine; it is a submersible.The technical difference between submarines and submersibles is that submersibles like Alvin require support vessels (surface or submarines) to transport them to their site of operations, launch / recover them, and replenish power, water, air, etc. after each use. They are also limited in space and air supply, which curtails their submerged operational time. These multiple factors are whey they are limited in their operational scope.Submarines are self-supporting units; while they may require support for repair and replenishment of crew needs (e.g., food), they do not require the type of support that submersibles do.
because it is a basic gas and cannot be reproduced.therefore we have a limited amount.
Because we are wasting it. There is only a limited supply of fresh water we can use. :(
Because of age and eternal issues, people are limited to what products they can use, otherwise because of age, or what the product may contain.
Rationing occurred during WWII because there were limited resources available.
The government is very wealthy and powerful but even so, it cannot solve everybody's problems, because it has limited resources.
it is limited because it is a republic.
Height was certainly a limiting factor because of the limited use of steel and glass.
limited because it has different governments
In third person limited narration, are you allowed to use they, and them?
Heologism is good for me because my vocabulary is limited.