1. Department of Engineering Mechanics, Zhejiang University, Hangzhou, China.
2. Soft Matter Research Centre (SMRC), Zhejiang University, Hangzhou, China.
3. Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Hangzhou, China.
4. State Key Laboratory of Fluid Power and Mechatronic System, Zhejiang University, Hangzhou, China.
5. Center for X-Mechanics, Zhejiang University, Hangzhou, China.
6. John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Nanobio Science and Technology, Harvard University, Cambridge, Massachusetts.