英和和英

a dependant

a hanger-on

a sponger

a parasite

a contributor

a quasi-incompetent （person）

a smuggler

a contraband trader

a permanent resident

a regular customer

a contributor

a trespasser

a convert

a proselyte

a recorder

solve for x

The master allows X.

an insulator―a switch

the univalent radical -COOH

There is X.

coaxial attenuator

I like X a lot.

X is very important.

the radical -NH2

It's too bad that X.

X has been pointed out.

rhesus factor antibody

X will come into view quickly.

X is first.

X has become clear.