数(かず)

素(そ)数(すう)とは、自(じ)分(ぶん)自(じ)身(しん)及(およ)び1という数(かず)でしか割(わ)り切(き)れない、1より大(おお)きい自(し)然(ぜん)数(すう)である。

• 素数是指只能被其自身和1整除的、大于1的自然数。

毎(まい)年(とし)タイを訪(ほう)問(もん)するヨーロッパ人(じん)の数(かず)とても多(おお)い。

• The number of Europeans who visit Thailand every year is very large.

分(ぶん)数(すう)b/aは1/aをb倍(ばい)した数(かず)を意(い)味(み)する。

• The fraction b/a means b times 1/a.

𝑥² = −1 となる数(かず) 𝑥（実(じっ)数(すう)ではない）を sqrt(−1) または i と記(しる)して虚(きょ)数(すう)単(たん)位(い)と言(い)う。

• When x² = −1, the number x (which is not a real number) is written as "sqrt(−1)" or "i", and is called the imaginary unit.

花(はな)子(こ)は壁(かべ)に顔(かお)を伏(ふ)せ、数(かず)を数(かぞ)え始(はじ)めました。「いーち、にー、さーん、しー、ごー、ろーく、ひーち、はーち、きゅー、じゅ。もういいかい？」「まぁだだよ」「もういいかい？」「もういいよ」それを聞(き)いて花(はな)子(こ)は、数(かず)を数(かぞ)えている間(あいだ)に隠(かく)れた友(とも)達(だち)を、さがし始(はじ)めました。

• Hanako turned her head towards the wall and began counting: "O—ne, Two—, Three—, Four—, Five—, Six—, Se—ven, Eight—, Nine—, Ten. Ready?" "Not yet." "Ready now?" "Ready." She then began to look for her friends who had hidden themselves in the meantime.
• Hanako put her face against the wall and started counting. "One Mississippi, two Mississippi, three Mississippi, four Mississippi, five Mississippi, six Mississippi, seven Mississippi, eight Mississippi, nine Mississippi, ten Mississippi! Are you ready yet?" "Not yet." "Now are you ready?" "Yes, you can come out now." When she heard that, Hanako began searching for her friends who had hidden while she was counting.