there is/are only 40% of which can reach the definition described in the introduction about 50% of loss of measured weld are in excess of 0.1db

首先，我觉得你的title里有点问题，好像是translate...into...不晓得是不是，有待native speaker 来回答。 我尝试翻翻看，不过不能作为答案呵呵， there are only 40 percent which are as good as it was described. 第二句完全翻不来，实测熔接损耗,用英文怎么说？我们做实验的时候这些什么损耗、热差、系数...都有专门的缩写的，你看看你的数据单上“实测熔接损耗”的英文缩写是什么？ it is about 50% which the "..." are above 0.1dB （感觉很别扭！）

i'm sorry...i don't know about chinese