Englishfor English speakers
membrane
Noun
—
A membrane is a thin layer of cells or tissue that acts as a boundary or lining that separates two environments.
acting
Verb
—
An acting director, president, head, etc. is in the position until the regular person returns to the job.
He was the acting chairperson for the committee when Tim went for surgery.
agent
Noun
—
An agent is a person that is a representative and acts for other people.