复数：proving grounds例句:1.next to the proving ground is the factory that make Proving ground是什么意思proving ground [英] [ˈpru:viŋ ɡraund] [美] [ˈpruvɪŋ ɡraʊnd]n.试验场; Prove difficult 和 prove to be difficult 有什么区别?
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Provided that 和proving that 区别是什么?当他们引导条件状语从句，翻译为“只要”“如果”的话，两者是一样的，可以相互转化。如we'll go to play basketball provided/providing.
Theorem是可数名词吗是，例如：many mathematicians simply set nettlesome questions like these aside and get back to the more pleasant business of proving theorems（.
武装突袭3proving graund（随意换装工具）怎么用啊输入序列号？这不是软件，只是个插件而已，像普通模组一样挂在，按esc后点击 initial proving ground 就可以了 在不行追.
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