对我们中的一些人来说，认为杯子是半满的想法或许是与我们的基因组成固定相连的，帮助我们摆脱生活的痛苦，享受积极的人生。
It seems that for some of us, seeing the glass as half full is hardwired into our genetic make-up, helping us shrug off the miseries of life and enjoy the positives.
在我们变形虫那样的远古祖先身体里，基因之间已经形成了固定的组合来一起从事构成细胞壁和其他基本的生命必要活动。
In our distant, amoeba-like ancestors, clusters of genes were already forming to work together on building cell walls and on other very basic tasks essential to life.
当预期的可同时植入的基因出现时，承认它的重组酶，会把它固定在DNA的两端，开始修补DNA(见图)。
When the intended gene, which would have been inserted at the same time, comes along, the recombinase recognises it, and binds the DNA to the ends, repairing the break (see diagram).
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