undertaking/ˈʌn.dɚˌteɪ.kɪŋ/名词工作;任务;企业;事业The construction of the tunnel is a large and complex undertaking.该隧道的修建是项复杂的大工程。正式承诺The manager gave a written undertaking that no one would lose their job.经理写下了书面保证,不会让任何人丢掉工作。想跟读,去练习