To date, there is no known function for hiccups.

直至今天，我们也不知道打嗝的作用。

Investigating the axolotl's genome, scientists saw many repeated sequences, most of which don't code for proteins and have no known function.

通过调查蝾螈的基因组，科学家们发现了许多重复序列，其中大部分不编码蛋白质，也没有已知的功能。

One of the commonest genes we have is for a protein called reverse transcriptase, which has no known beneficial function in human beings at all.

我们体内有一种最为常见的基因——一种被称为逆转录酶的蛋白质，据知它在人体内根本不起任何好作用。