Thyroid nodules are very common all over the world, and China is no exception. Ultrasound plays an important role in determining the risk stratification of thyroid nodules, which is critical for clinical management of thyroid nodules. For the past few years, many versions of TIRADS (Thyroid Imaging Reporting and Data System) have been put forward by several institutions with the aim to identify whether nodules require fine-needle biopsy or ultrasound follow-up. However, no version of TIRADS has been widely adopted worldwide till date. In China, as many as ten versions of TIRADS have been used in different hospitals nationwide, causing a lot of confusion. With the support of the Superficial Organ and Vascular Ultrasound Group of the Society of Ultrasound in Medicine of the Chinese Medical Association, the Chinese-TIRADS that is in line with China's national conditions and medical status was established based on literature review, expert consensus, and multicenter data provided by the Chinese Artificial Intelligence Alliance for Thyroid and Breast Ultrasound.

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.201900930.Metasurfaces, planar arrays composed of subwavelength engineered phase-shifting scatters, have been an emerging platform for advanced and functional control of electromagnetic (EM) waves by manipulating the local properties of amplitude, phase, and polarization of the reflected or transmitted waves. [1][2][3][4][5][6][7][8] The reliability and flexibility of wavefront manipulations by metasurfaces within subwavelength thickness then lead to many new physical effects and versatile applications, including anomalous light refraction, [4,5] invisibility cloak, [9] vortex beams, [10,11] and many other functional metadevices. [12][13][14][15][16][17][18][19] Nowadays, with the rapid development of modern wireless and optical technologies, increasing demands on high communication speed/quality, large data storage capacity are urgently required. The information capabilities of the metasurfaces can be

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