为什么史铁生的家人避免刺激他，但余华、莫言等好友却不用顾忌?

(used at the end of a declarative sentence for emphasis)

and so on; etc.; et al.

need not

(fig.) zeal

old variant of 卻|却[que4]

for what reason?

to avoid

used in 万俟[Mo4 qi2]

irritant

(old) servant