由於便利商店大多是廿四小時營業，門市人員疲累及危險，亦導致基層人員嚴重

由於便利商店大多是廿四小時營業，門市人員疲累及危險，亦導致基層人員嚴重不足。

結果 (英文) 1:

Since most convenience stores are open 24 hours a day, the store staff is exhausted and dangerous, which also results in a serious shortage of grassroots personnel.

結果 (英文) 2:

Since most convenience stores are open 24 hours a day, the store staff are tired and dangerous, which also leads to a serious shortage of grass-roots staff.

結果 (英文) 3:

As most convenience stores are open 24 hours a day, the fatigue and danger of store staff also lead to a serious shortage of grass-roots staff.