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1·Theres many a slips twixt the cup and the lip.

杯到囗边也会失手；功亏一篑。

2·Twixt rosy dawn and rosy dawn there came unto me a new truth.

在两次朝霞之间，真理给了我新的启发。

3·But there's many a slip 'twixt cup and lip, and no important graphene products are yet on the market.

但常言凡事都难十拿九稳，至今市场上也没有多少重要的石墨烯产品。