我从来没有长过骨刺。
What is a bone spur? He asked himself.
骨刺是什么玩意儿？他问自己。
I wonder what a bone spur is, he thought.
不知道骨刺是什么玩意儿，他想。
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。”
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。
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。
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