a deep understanding of a person or thing

To continue to exist after.

to make tired

sth such as a letter or symbol

A highly contagious viral disease characterized by fever, weakness, and skin eruption with pustules that form scabs;

to finish; to bring something to an end; to decide after careful thought

let sb find out about sth by giving them experience of it or showing them what it is like

to give someone a disease

deadly

injection of a weakened or mild form of a pathogen to produce immunity

to administer a vaccine

one of four equal parts

to get rid of

very large or great; beyond ordinary means of measurement

to use sth as the basis on which to develop and make progress

A preparation of weakened or killed pathogens

type of lung disease

A highly contagious infectious disease of the spinal cord caused by a filterable virus.

actually; in fact; true in reality

modest

Information obtained through the senses.

The act of trying out a new procedure, idea, or activity.

gradually reach a particular stage

regularly

to hit repeatedly

to put someone or something in a situation where they could be in danger

hard and fixed in shape

an act of becoming fully aware of something as a fact.

character or personality

a truth, a rule, or a law