That's because glycine is one of only twenty amino acids essential to human life, and probably all life as we know it.

这是因为甘氨酸是人类生命必需的 20 种氨基酸之一，可能是我们所知道的所有生命必需的。

To their surprise, amino acids, essential for life, formed in the experiment.

令他们惊讶的是，实验中形成了生命必需的氨基酸。