There is no doubt that..., There is no doubt that...
It is clear that..., it can be stated without hesitation that...
(See Niddah 15b, and likewise: "There is no doubt that Noah, Shem, and Japheth were with them, and they were among the people of the tower" - Ibn Ezra, Genesis, another commentary, explanation of chapter 11).
Translation
Expression (Hebrew)
אֵין סָפֵק שֶׁ..., אֵין סָפֵק כִּי...
Definition (Hebrew)
בָּרוּר שֶׁ..., נִיתָן לְקַבֵּעַ בְּלֹא הִסּוּס כִּי...
(רְאֵה נִדָּה טו ע"ב, וְכֵן: "אֵין סָפֵק כִּי נֹחַ וְשֵׁם וָיַפֶת הָיוּ עִמָּהֶם, וְהֵם אַנְשֵׁי הַמִּגְדָּל בֵּינֵיהֶם" - אִבְּן עֶזְרָא בְּרֵאשִׁית שִׁיטָה אַחֶרֶת- פֵּרוּשׁ פֶּרֶק יא).