It is my experience that Chinese speakers (and perhaps many others) don't like to repeat words, thinking is it some sort of error. That's just not true, especially in the case of technical details.Everyone thanks for your prompt reply. What I'm saying here is:
1. It can be performed by the user, under the supervision of qualified service personnel.
2. It can be performed by qualified service personnel.
I'm trying to eliminate the second occurrence of "qualified service personnel" by combing the sentences into one.
It doesn't sound better to me because there's some ambiguity -- is "professional supervision" the same as "qualified service personnel"? Is the "qualified service personnel" even connected to your company? The reader has no way of knowing -- he may think that his boss constitutes "professional supervision."It seems that my sentence does not do the trick. Here's another revision:
Filter installation and maintenance can either be performed by users under professional supervision, or by qualified service personnel.
Does this one sound better?
Take out "one of":This procedure is best carried out by qualified service personnel since deadly voltage is present when the product is in operation. However, if someone, say the purchaser of this device, wish to perform it, the entire process must be monitored.
Copyright’s version is neat, however it might not necessarily be “one” person to perform the action. Chances are there could be many service personnel performing this installation/ maintenance on multiple devices or two personnel installing on one device to speed up the process.
The installation can only be performed by qualified service personnel or under their supervision.Repeating twice sounds fine to me. But in some occurrences there can be more than three “qualified service personnel” in a single paragraph. To me, this sounds like computer codes and tedious.
Here’s an example I made up on the fly: The installation can only be performed by qualified service personnel. If you wish to perform yourself, do so under the supervision of qualified service personnel. Refer all services to qualified service personnel.