submergence
加入词篮leak
leakage
leaky
crack
rupture
slit
rip
gap
slot
groove
chip
cracked
strand
aground
shoal
shallow
save
saviour
saving
lifesaving
rescure
rescuer
salvation
life
lifeguard
life raft
lifeboat
lifeline
life preserver
life jacket
lifebuoy
life vest
lifebelt
first aid
first aider
first-aid course
first-aid kit
digital
digital library
digital signal
signal
digital technology
numerical
sensor
image sensor
optical sensor
remote sensor
monitor
termination
actuator
monitoring
scrutiny
telephone
telephone directory
telephone exchange
telephone tapping
receiver
recipient
handset
beeper
videophone
telephony
operator
telephonist
wireless
cordless
radio
acoustic
acoustic aid
acoustic amplifier
teleprinter
telesales
telemarketing
call
long-distance call
local call
area code
call up
ring up
make phone calls
make telephone calls
hold on
phone
car phone
cellular phone
cellphone
mobile phone
payphone
phone booth
pay station
phonecard
phone box
directory toll
connect
disconnect
switchboard
extension
