assure

保证；担保；使确信；弄清楚英释vvto tell someone that something will definitely happen or is definitely true so that they are less worried

1 assure oneself,弄清楚，查明

2 assure of,vt. 向...保证）；查明（使相信

1 The document is genuine, I can assure you ..我能向你保证，这文件是真的。