head amino acid 领头氨基酸
N a person who uses LSD 瘾君子 [slang]
The ribosome finds the appropriate amino acid for each "letter" and assembles them head-to-tail in sequence; other "letters" indicate when to start and when to stop.
核糖体找到每个“字母”的适当的氨基酸，并将它们首尾相连，组成一个序列；其他“字母”表示何时开始以及何时停止。
Ahna Deverey, shopping at a grocery store in suburban Milwaukee, shook her head at milk with added DHA/omega-3 fatty acid.
在密尔沃基市郊杂货店购物的Ahna Deverey，面对添加了DHA / omega-3脂肪酸的牛奶摇摇头。
Adding folic acid to diets costs four or five cents per head per year, with a payback of perhaps 120-fold.
而在食物中添加叶酸仅需每人每年四到五美分，其收益可能达120倍之多。
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