【稳定】

leyla

"Sound" 在英语里除了声音也是个形容词 "合理的, 可靠的, 健康的, 完好的"，英语定义是：stable, good condition, financially secure, no defects from truth, reason, or judgment. 不用特意去把定义全都背起来，它想成 稳定 就行：A sound business. Sound advice. He's safe and sound.