paint-by-number
/ˌpeɪntbaɪˈnʌmbə(r)/adjective
1- denoting a child's picture marked out in advance into sections which are numbered according to the colour to be used按数字填色的（指要根据数字标示分区填色的儿童图片）。
1.1
- figurative denoting something mechanical or formulaic rather than imaginative, original, or natural〈喻〉机械的, 公式化的, 缺乏想像力的, 缺乏独创性的; 不自然的：
a paint-by-number way to feel or act.
感受和表演上的机械方式。