bolt on

基本解释

The load coefficient method of bolt on tensile strength calculation was improved.
对螺栓拉伸强度计算的载荷系数法作了进一步改进。
Could've just gone for a tiny lightning bolt on the forehead but, nope, went all the way.
难道就不能在额头上纹一个小闪电么？不行，全都得上。
It is a one-speed bike with a skull flag and a lighting bolt on it.
是一辆单速自行车。上面还插着一面画着骷髅头和闪电的小旗子。
http://www.ypgogo.com

"There's a nut on the inside of the oil pan. The bolt came out. But the nut was not welded corectly to the oil pan,so the nut fell off.
On first impression, Bolt may seem to be a show-off.
He smiles at the television cameras, sticks out his tongue with antic poses and hand gestures, strikes his "lightning bolt" pose, and tells reporters that he is on his way "to being a legend."

Livemocha also allows Rosetta Stone to bolt on products in a lower price point.
FORBES: Rosetta Stone Acquires Livemocha And Expands Its Reach In The Cloud