In addition to 'y' and 'n', one of the answers you can give when it asks you about a hunk is 's', for 'split this hunk in to smaller hunks'. The full list:
y - stage this hunk
n - do not stage this hunk
q - quit, do not stage this hunk nor any of the remaining ones
a - stage this and all the remaining hunks in the file
d - do not stage this hunk nor any of the remaining hunks in the file
g - select a hunk to go to
/ - search for a hunk matching the given regex
j - leave this hunk undecided, see next undecided hunk
J - leave this hunk undecided, see next hunk
k - leave this hunk undecided, see previous undecided hunk
K - leave this hunk undecided, see previous hunk
s - split the current hunk into smaller hunks
e - manually edit the current hunk
? - print help
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…