"a diversion from the main highway"
"a digression into irrelevant details"
"a deflection from his goal"
1.
1. 枝蔓:Diffusion 扩散 |digression 枝蔓 | Dilthey 狄尔泰
2. 离题,枝节话:regress 退回,后退,逆行; 回归 |digression 离题,枝节话 | perhaps 也许,可能,多半
3. 离角,极方位距,天文:座标读取头 digitizing head | 离角,极方位距,天文digression | 两面角 dihedral angle
形容词::digressional