There are two main groups of bats, which are believed to have evolved independently of each other, but both from a common ancestor.

蝙蝠主要有两大类，人们认为它们是各自独立进化的，但都来自同一个祖先。

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These bats can distinguish between the two, and not just with trees, but with any echo that comes in a smooth or rough shape.

这些蝙蝠能够区分这两种声音，不仅仅是通过树木的回声，而是通过任何平滑或粗糙的回声。

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Two thugs clubbed him with baseball bats.

两名暴徒用棒球棍狠打了他。

《柯林斯英汉双解大词典》

Clayton actually contains only two roosting bats, but they are an unusually gregarious couple, inviting over scores of friends to fly among the rafters, and defecate with abandon.

ECONOMIST: Bat raves

Sabathia (5-4) matched his season high with 10 strikeouts following two months of a puzzling drop in velocity, and New York got two key bats back Friday night in a 4-1 win over the Boston Red Sox that stopped a season-high, five-game losing streak.

WSJ: Yanks beat Boston 4-1 as Teixeira, Youkilis return

In the two years of BATS' existence, Wall Street has flocked to its side.

FORBES: Intelligent Investing Briefing Book