recklessness

The lads’ energy pleased him but their recklessness worried him.

小的劲头他兴,他的冒他担心。

This very recklessness makes me feel that these costly operations may be only the prelude to far larger events which impend on land.

这种孤注一掷的作法，我感到这些代价重大的战役，也许正是陆上即将发生远为重大事件的一个前奏。