What is worth doing at all, is worth doing well. (Prov) 由于教学上的需要，长期以来我一直在探索肯定句中 at all 的含义。但是，由于这方面的资料很少，直到现在我仍然没搞明白。
用在肯定句中的 at all 不像用在否定句中的 (not at all) 那么常见, 而且意义也较多, 一般可译为“根本”“到底”“真的”“竟然”“毕竟”。
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What is worth doing at all, is worth doing well. 凡是真的值得做的事,就值得把它做好。
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I'm surprised you came at all. (Evans) 你竟然来了，很使我吃惊。
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The question is not so much whether he works much as whether he works at all. 这与其说是他干得多还是干得少的问题,还不如说是他根本干不干的问题。
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This correspondence indicates that the O and C of an SVOC clause are in the same relation to one another as the S and C of an SVC clause: She was beautiful. This relation is expressed, wherever it is made explicit at all, by a copular verb ... (CGEL) 这种对应关系表示，在SVOC句型中，宾语和表语(主语补语)的关系是与SVC句型(She was beautiful.)中主语和表语的关系相同的。这种关系，凡在确实需要明确表达的地方，都要用连系动词表达出来。
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It is significant that despite (in spite of) the rapid advance of science since the seventeenth century, it made no impact on the problems of prediction until the advent of the digital computer, and it is only thanks to (owing to) the powerful new computers that worth-while prediction in human affairs has been possible at all. (CBSE) 意味深长的是,虽然自17世纪以来科学迅速发展,但是在数字计算机问世之前,科学对预测问题并没有产生什么推动作用,只是在有了大功率的新型计算机之后,对人类事物进行有价值的预测,才算确实有了可能。
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You are fortunate to be able to speak even a little Spanish at all. 你很幸运,毕竟还会讲点西班牙语。
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To be able to do that at all meant the assimilation of the complete range of science as well as a deep knowledge of history and philosophy. 确实能够做到这一点，就意味着对全部科学的融会贯通，以及对历史和哲学的深刻理解。