מַרְאֵ֨ה הָאוֹפַנִּ֤ים וּמַעֲשֵׂיהֶם֙ כְּעֵ֣ין תַּרְשִׁ֔ישׁ וּדְמ֥וּת אֶחָ֖ד לְאַרְבַּעְתָּ֑ן וּמַרְאֵיהֶם֙ וּמַ֣עֲשֵׂיהֶ֔ם כַּאֲשֶׁ֛ר יִהְיֶ֥ה הָאוֹפַ֖ן בְּת֥וֹךְ הָאוֹפָֽן׃
眾輪的樣子和構造，好像他施寶石的光彩；四個輪子都是同一個模樣；它們的樣子和構造，好像輪子套在輪子當中。
Rashi
like the appearance of crystal Heb. תַּרְשִּׂישּׂ, like a precious stone named tarshish, cristal in French.
Rashi
as...would be A wheel set within a wheel, crosswise. Since they go to every side, with their faces to the four directions, the wheel must roll in its four directions.