qiān lǜ yī dé
a thousand tries leads to one success (idiom, humble expr.); Even without any notable ability on my part, I may still get it right sometimes by good luck.
千
qiān
used in 鞦韆|秋千[qiu1 qian1]
虑
lǜ
to think over
一
yī
one
得
dé
to obtain