It won't move unless we charge it. Let's charge it, okay?
It will only work if we charge it, so let's charge it.
We need to charge it for it to work, so let's charge it, okay?
「充電する」は、charge でOKですよ。
英訳① unless は「～しない限り」という意味の接続詞です。
英訳② only ... if ～は「～するときだけ、…する」、for ... to ～は「…が～するためには」という意味を表せます。
その他の言い方：
- It won't work unless we charge it. Let's charge it, okay?
- It won't work if we don't charge it, so let's charge it. Okay?
- If we don't charge it, it won't work. So let's charge it, okay?
Unless you charge it, it won't work. Let's always make sure we charge it.
Unless you charge it, it won't move. Let's always make sure we charge it after using it..
小さい子供には色々説明しないとですよね！
充電する ＝ charge ; charge the battery (電池）
充電終わるまで待っててね = please wait till it's finished charging
Let's always make sure we charge it ＝ いつもちゃんと確認して充電しましょう
after using it ＝ 使った後には
アメリカ合衆国 
日本 
