Base commanders and the Pentagon said they had no early indication of a motive for the shootings.

基地指挥官和五角大楼军说，之前只有迹象表明有枪击的动机。

youdao

Major Nidal Malik Hasan's motive for the rampage was unclear, but investigators hope to get some answers when they interview him; he was shot and injured by a police officer at the base. See article.

目前尚不清楚Nidal Malik Hasan上校此次枪击暴行的动机，但是调查者希望通过审问而得到一些答案；在基地被一位警员射伤。

youdao

In addition, by carrying forward and developing Beethoven 's cyclic form on the base of modern musical language, Bartok created leading motive technique.

此外，主导动机贯穿的手法则是巴托克在运用现代的音乐语言的基础上对贝多芬晚期的“贯穿曲式”的继承与发扬。

youdao

That was never in doubt, but the Allies hoped the stand against Germany's naked aggression would persuade Hitler to step back from the brink of all-out war, a motive that was neither base nor ridiculous.

ECONOMIST: The second world war