Niam is still learning to master the technique of mixing and layering colours.
尼亚姆现在仍在学习颜色分层和叠加技能。
2
Generally, the layering occurs on an annual basis, hence the observed changes in the records can be dated.
一般来说，分层是按年进行的，因此我们可以确定记录中观察到的变化的日期。
3
After de-layering in this way, a company may be left with just a top level of senior managers, front-line managers and employees with direct contact with the public.