Android's explosive growth over the past three years has been a double-edged sword for its apps.
过去三年中Android系统迅猛发展，这对于相关的应用程序来说是柄双刃剑。
First link is the three elements of SEO is an important part of the link is like a double-edged sword, both advantages and disadvantages.
首先链接是SEO的三要素中的一个重要部分，链接就像是双刃剑，有利有弊。
The multi-edged needle is a three-edged needle.
所述的多棱针为三棱针。
The multi-edged needle is a three-edged needle.
所述的多棱针为三棱针。
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