air-gap

air-leak

aperture

backlash

Giải thích VN: Là kẽ hở giữa các bánh răng khớp với nhau.

bearing slackness

black lash

chink

clearance

clearance space

cleft

cranny

crevice

day

fin

fissure

flaw

freedom

gaping

interstice

interstices

joint opening

mouth

opening

play

pore

pore space

rive

shake

shutter

slack

slit

slot

slotted opening

tip clearance

valve clearance

void

void coefficient