它的分子结构中含有双键、羧基和阴离子，可以把常用乳化剂乳化时在乳胶粒表面的物理吸附结合方式改变为化学键合形式。

Using the emulsifier, the way of physical absorption that con- ventio nal emulsifiers combine with the latex can be transferred into chemical bonding .

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两个氧原子以双键形式结合形成氧分子，这种氧分子使地球上的生命成为可能，但这种氧分子从来没有在太空中发现过。

Its molecular form, with two atoms joined by a double bond, makes life on Earth possible - but this form had never definitively been seen in space.

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