Lucy knows how to add and substract but fractions have her up a stump.
做加减法，露西不成问题，可分数却难倒了她。
Substract: Venture Capital in the forestry Hi-Tech industry has been studied in this article.
本文对我国林业高新技术产业创业投资问题进行了研究。
Differences in performance between coated tools explained through a separate consideration of substract and coating influences.
通过分别考虑基体和涂层的影响，阐明了涂层刀具之间性能的原因。
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