combination的近义词为mixture
例句
1、
His treatment was a combination of surgery， radiation and drugs.
对他的治疗是把手术、放射和药物治疗结合为一体。
2、
An alloy is a combination of two or more different metals.
合金是两种以上不同金属结合而成的。
3、
A combination of internal and external factors caused the company to close down.
内外因结合导致了公司的倒闭。
