an act of sheer bravado是什么意思？

an act of sheer bravado

纯属逞能的举动

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

act

v. 行动，表现，表演，起作用；n. 行为，行动，法案，法令，短节目；

例句
There are many people who still find the act of abortion abhorrent.
仍有很多人对堕胎行为表示厌恶。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

sheer

v. （使）偏航，（使）转向；adv. 完全地，全然，垂直地，陡峭地；n. 舷弧，单锚系泊的船位，偏离的方向，船体型线；adj. 完全的，全然的，极薄的，几乎垂直地，陡峭的，绝对的；

例句
For sheer scale and grandeur, Leeds Castle in Kent takes some beating.
单从规模和气势来说，肯特的利兹城堡独领风骚。

bravado

n. 虚张声势，故作勇敢，冒险；

例句
As a footnote, I should add that there was one point on which his bravado was more than justified.
我补充一句，他有时表现得过分逞强。