1~4

absolutely necessary; too important not to have

in a way that is too much, beyond a usual or proper degree

to an excessive degree, or too much

needing the support of; relying on someone or something

large or important to have an effect

having〜as its foundation or starting point

the study of the brain and nervous system

to state or metion〜in order to give someone information

in a way that is too much, that is not reasonable or normal

in a way that is difficult to stop or control

to put a limit on what can and cannot be done

having the possibility that you cannot stop something harmful