我从来没有长过骨刺。
I wonder what a bone spur is, he thought.
不知道骨刺是什么玩意儿，他想。
The protein, known as bone morphogenetic protein, or BMP, is used to spur bone growth.
这种被称为骨形成蛋白(BMP)的人造蛋白质被用于刺激骨骼生长。
What is a bone spur? He asked himself.
骨刺是什么玩意儿？他问自己。
But would the bone spur hurt him too much?
不过骨刺会不会使他痛得太厉害？
"I do not know" he said aloud. "I never had a bone spur."
“我说不上来，”他说出声来。“我从来没有长过。”
"I do not know" he said aloud. "I never had a bone spur."
“我说不上来，”他说出声来。“我从来没有长过。”
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