出典:Wiktionary
A misfortune never comes alone.
Misfortunes never come singly.
Misfortune never come single.
Misfortunes never come singly.
I bear in mind that misfortunes never come singly.
No complaints have been received so far.
Things are not always what they seem.
a chapter of accidents [misfortunes]
One calamity follows on the heels of another.
Good luck alternates with misfortune.
supertwisters are fortunately rare