要使之格式良好，要么切换开始标记顺序，要么切换结束标记顺序。
To make this well-formed, you would need to switch either the opening tag order or the closing tag order.
用特异化学标记的短链DNA取代了混有稀土的复合物，每一个链有不同顺序的基因编码。
In place of combinations of rare-earth compounds, its unique chemical markers are short stretches of DNA, each with different sequence of genetic code.
沉积物内含有孢粉化石，而每一粒孢粉都含有能告诉我们答案的碳原子标记，容许我们按照地质时间的顺序分析样品。
The sediments contained fossil pollen. Each grain had a telltale carbon atom signature, allowing them to put the samples in chronological order.
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