one substance consists of A & B,and A accounts for the main part/and A dominates.
以...为主 的表达很多，这里侍脊衫根据具体语境，野并还是占了主要的部分这样翻比较好老腔
This item comprises A and B, with A being the principal component.
account for the main part of
It can be seperated in A and B , A is more important
base on
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