这种药物有一个很大的限制因素，其药效只能持续6个小时。

This drug has one important limitation. Its effects only last six hours.

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然而，仍然有一个很大的障碍。

However, there is still a big stumbling block.

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这里有一个很大的障碍。

There is one big snag.

youdao

It had huge parks as part of its land, where he first learned to hunt butterflies and mount them.

在他的土地上有一个很大的湖，他就是在那学会了抓蝴蝶。

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that we have these really big parks in the centre like this one

我们在市中心有一个像这样的很大的公园，

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So, now you have a single molecule, very large molecule, with not just two binding sites but with ten binding sites.

所以如果你体内有一个细胞,一个体积很大的细胞,细胞表面不只有两个抗原结合位点,而有十个抗原结合位点

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