When did you sew on these chevrons , sergeant lipton ?

你何时把这些阶级绣上去的李普中士？

These chevrons do not show up in the final envelopes .

在最终的信封中不会显示此符号。

Others built chevrons of plastic booms to block the oil from coming ashore .

有的制作了塑料帆桁以阻挡原油向海岸的渗漏。

It sports chevrons on the nacelles , or fan housings .

它在引擎吊舱或者风扇外罩上运用chevrons技术。

The new boeing 787 is among the most modern jets relying on chevrons to reduce engine noise levels .

新客机波音787是那些依赖chevrons技术以减少引擎噪音水平的最先进喷气机之一。