过去，人们在输液时，常常需要自己时时注意盐水的剩余情况，以便及时通知护

过去，人们在输液时，常常需要自己时时注意盐水的剩余情况，以便及时通知护士更换盐水或者拔掉针头。即便如此，由于
患者熟睡，或者过于专心于其他事情而忘记拔去盐水针头从而导致血回流的现象不计其数。

結果 (中文) 3:

In the past, people in the infusion, often need to own the remaining saline attention all the time, in order to notice the nurse to replace salt or pulled out the needle. Even so, the
patients sleeping, or too concentrate on other things and forget to unplug the saline needle which leads to blood backflow phenomenon too many to count.