塔吉特公司早些时候转向芯片和密码的努力从未取得进展。

An earlier effort by Target to move to chip and PIN never gained progress.

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试图把特定的语言功能和大脑特定区域相联系的努力还没有取得很大进展。

Attempts to correlate specific language functions with particular parts of the brain have not advanced very far.

《柯林斯英汉双解大词典》

然而，控制这些蚊虫的努力一直没有进展，关键在于鉴别蚊虫的难度和费用——至少有3,500种不同蚊虫，其中有不少很难加以区别。

However, efforts to control them are consistently undermined by the difficulty and expense of identifying mosquitoes-of which there are at least 3,500 species, many of them hard to tell apart.

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