standby

• 形容某物随时准备着在需要时立即使用，或处于待命、备用状态。

Describes something that is kept available for immediate use when needed, or a state of readiness.

1. Ready for immediate useB2formal

   Describes something that is kept available to be used in an emergency or when needed.

   备用的

   • The hospital keeps a standby generator in case of a power outage.
   • We have a standby crew ready to respond to any technical issues.
   • The airline offered standby tickets for last-minute travelers.

   同义词alternateauxiliarybackupemergencyfallbackreservespare

   反义词activemainprimary

• 名词，指在需要时可以依靠或动用的后备事物或人选；也指能随时替代主要演员的替补演员。

A noun referring to something that can be relied on when needed, or an actor able to replace a regular performer when required.

1. Reliable resourceB2formal

   Something that is kept available and can be relied upon when needed.

   后备

   • This old generator is our standby in case of a power outage.
   • She always keeps a spare tire as a standby for emergencies.
   • The emergency kit is a standby for any unexpected situation.

   同义词alternativebackupfallbackreservestopgapsubstitute

2. Replacement performerB2formal

   An actor or performer who is ready to replace a regular performer when required.

   替补演员

   • The standby was called in when the lead actor fell ill.
   • She worked as a standby for the main singer during the tour.
   • The theater always has a standby ready for last-minute changes.

   同义词alternatebackupdoublesubstituteunderstudy