1、弄清楚
assure 深信不疑地对··说，向··保证 assure oneself 弄清楚 I assured myself that the bridge was safe before crossing it 我弄清楚那坐桥确实安全才通过 ..
2、查明
... assure vt. 保证；担保；使确信；弄清楚 assure oneself 弄清楚，查明 assure of vt. 向...保证）；查明（使相信 ...
3、确实弄清楚
... assure v. 保证,确告,担保 assure oneself 确实弄清楚，确保 assure... of 向...保证一定...，肯定地向...说 ...