If something is many-sided, it has a lot of different qualities or features — not one simple face.

If something is如果某件事是 many-sided多面向的 it has它就有 a lot of different qualities or features很多不同的特質或特徵 not one simple face而不是只有單一的面向

A many-sided person has many skills or moods; a many-sided problem has many causes and no single easy answer.

A many-sided person多面向的人 has有 many skills or moods很多技能或情緒 a many-sided problem多面向的問題 has有 many causes很多原因 and no single easy answer而沒有單一簡單的答案

It is a slightly careful, written kind of word; in speech people often say “it has many sides” instead. You will see it in school writing about people, books, and arguments.

It is這是 a slightly careful, written kind of word一個稍微正式、書面用的詞 in speech在口語中 people人們 often say常說 'it has many sides'『it has many sides』 instead來代替 you will see it你會看到它 in school writing about people, books, and arguments在描寫人物、書籍、論點的學校寫作裡

The picture behind it is a shape with many sides, like a box. Though actually we almost always use it about character and ideas, not about geometry class — if you mean a shape with many sides, people usually say polygon, or just name the shape.

The picture behind it這個詞背後的畫面 is是 a shape with many sides一個有很多邊的形狀 like a box像箱子一樣 though actually不過實際上 we幾乎都 almost always use it用它 about character and ideas來講性格和想法 not about geometry class而不是幾何課 if you mean如果你是指 a shape with many sides有很多邊的形狀 people usually say人們通常會說 polygon多邊形 or just name the shape或直接講出形狀的名稱