Thereby, {HEAD ~ the semiconductor laser tip} can be sealed in {TAIL ~ the hollow portion}, so that the semiconductor laser tip can be protected from dust, moisture and the like 
sealed in
Thereby , { HEAD ~ the semiconductor laser tip } can be sealed in { TAIL ~ the hollow portion } , so that the semiconductor laser tip can be protected from dust , moisture and the like
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH