The HR department organizes a one-week training to help new staff get onboard quickly.

onboard 由介词 on（在...上）和名词 board（木板、甲板）组成，原指"登船/登机"。在现代商业用语中引申为"适应新环境/融入团队"的意思，特别指新员工熟悉工作流程和企业文化的过程。