This is the 5911th most frequent Chinese word.
外用
For external use.
The term '外用' here specifies the method of application, emphasizing that the product is for external application and not internal consumption.
这药是外用的，不能口服。
This medicine is intended for external use and should not be ingested.
In this sentence, '外用' describes the function and intended application method of the disinfectants, highlighting their use on external surfaces.
外用的消毒剂可以有效杀菌。
Externally applied disinfectants can effectively kill bacteria.
Here, '外用' indicates that the treatment for the wound is to be applied on the surface of the skin rather than through other methods.