In letters three foot high 这些字达三呎高
English crossword clues are exercises in riddling—one of my favourites was “golden parent” in three letters, answer “mum.”
（英文的填字游戏就像猜谜——我最喜欢的一条是golden parent，让猜三个字母的单词，答案是mum）。
Three scientists recently published a paper in the journal Physical Review Letters showing that there are conditions under which a carpet could fly.
三个科学家最近在《物理评论快报》日刊中发表了一篇文章。 文中描述了一些毯子可以飞翔的条件。
In all existing life forms, the four "letters" of the genetic code, called nucleotides, are read in triplets, so that every three nucleotides encode a single amino acid.
在所有现有的生命形式中的四个“字母”的遗传密码，即核苷酸，是以三个为单位读取的，每三个核苷酸编码成为一个单独的氨基酸。
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