英和和英

to break through a line of defence

pierce a defense line

break a blockade

break [run] a blockade

relax one's vigilance

to break through obstruction

to break through reserve

to withdraw a warning

the action of breaking through an obstacle

over [across] the border

an indication or sign suggesting cautiousness

a state of emergency about which a warning needs to be issued

the action of breaking through a barrier

to warn

to go at regular intervals round an area to see that there is no trouble

to develop alarming symptoms

a warning to be ready for danger

to be cautious of one's surroundings

a warning-signal

an early warning

a loud warning signal produced by a burglar alarm

a whistle that is used to signal a warning

a warning sign

the condition of there being heavy security

the state there being heavy security

an early‐warning radar

Forewarned is forearmed.

We need to stay alert.

the act of broadcasting information on an emergency system

You can't be too vigilant.