This process is termed "replacement" because solutions have dissolved the original material and replaced it with an equal volume of the new substance.
这个过程被称为“置换”，因为溶液溶解了原来的物质，并用等量的新物质取而代之。
Note that we pass this method two parameters: the value we want to replace (Scriptign) and the replacement text (Scripting). After we run this command $a will be equal to this
注意我们传递给这个方法两个参数：我们想要替换的值(Scriptign)及用来替换的文本(Scripting)。
Equal-density, high-density and low-density spinal-epidural anesthesias are all safe and reliable in elderly hip replacement.
等密度，高密度，低密度腰麻-硬膜外联合麻醉在老年髋关节置换术中的应用均是安全可靠的。
Equal-density, high-density and low-density spinal-epidural anesthesias are all safe and reliable in elderly hip replacement.
等密度，高密度，低密度腰麻-硬膜外联合麻醉在老年髋关节置换术中的应用均是安全可靠的。
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