Then pour a capful of this into the bucket and mix.

杰瑞：然一瓶盖倒入桶并混。

A " capful" would be the amount of liquid that would fit into the cap of the bottle.

“capful”适瓶盖的液体量。

After she puts this capful of liquid into the bucket, Helen is supposed to mix it.

在这一瓶液体放入桶，伦应该其混。

Notice there's just one " l" in " capful" even though the word " full" normally has two " l" s.

请注意，“capful”只有一个“l”，尽管“full”一词通常有两个“l”。

So Jerry tells Helen " to pour" (pour) the liquid into the cap until she has a " capful." " Pour" means to move liquid from one container to another.

于杰瑞告诉伦把液体“倒”（pour）到瓶盖里，直到有一个“满满的”。“倒”的意思把液体从一个容器移到另一个容器。