In this paper, datum marks of settlement observation, layout of observation points, observation methods, observation instruments, calculation software and observation precision are introduced.

该文详细介绍沉降观测基准点、沉降观测点布设过程及观测方法，介绍使用的观测仪器、计算软件及观测精度；

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Though you could fault the fact that you can't quite tell what each of these 15 figures (plus a dog and a cat) is looking at, you can only be amazed at the observation of their family dynamics, and the exquisite portrayal of their musical instruments and clothes.

WSJ: Review: The Power of Observation | 'Johan Zoffany: Society Observed' at the Royal Academy | 'Turner Inspired' at the National Gallery in London