?无故障

... 无故地 gratuitously 无故障 faultfree; test ok; trouble free; troublefree; zero defects 旭 - 有缘无份 club remix ...

?无缺陷的

... 人体缺陷的 defectological 无缺陷的 faultfree; flaw free; flawless; no defect; non defective; perfect 营养缺陷的 auxotrophic ...

?可靠的

...faultfree; firm; good; positive; reassuring; rel reliable; reliant; respinsible; responsible; secure; surefire; tried; veracious 确实可靠的情报资料 reliableinformation ..