Even innocuous substances can sometimes register a positive result in a drug test. 即使无害的物质在药物测试中有时也会呈阳性。
The question appeared innocuous enough, but I still did not trust her. 这个问题看来没什么恶意,可我仍然不相信她。
The liquid looked fairly innocuous. 这种液体看来没什么危险。
And the materials are transparent, achromatic, smellless, and innocuous.They won't affect the color and the vein of tiles. 而且这种材料透明、无色、无臭、无毒,同时也不影响[抛光砖的花色及纹理效果。