A process by which the hydrocarbon molecules of petroleum are broken into simpler molecules, as of gasoline or kerosene, by the addition of hydrogen under high pressure and in the presence of a catalyst.
氢化裂解将石油的含氢分子分裂成更简单的分子（象汽油和煤油的分子）的过程, 此分裂过程是在加催化剂及高压氢气的条件上进行的
A substance, especially an enzyme, that initiates or modifies the rate of a chemical reaction in a living body; a biochemical catalyst.
生物催化剂能在活的体内产生化学反应或改变生物体内化学反应速度的物质, 尤指酶; 生物化学催化剂
The offer of a new job provided just the catalyst she needed.
这份新工作正是她所需要转变的契机。
