多くの人間にとって三角関数を学ぶことは無意味であるように思える。

tbd

I think that for many people learning the trigonometric functions is meaningless.

彼女の言葉はまったく無意味だった。

tbd

Her words were completely meaningless.

Her words were wholly void of meaning.

What she said was completely meaningless.

彼女のその問題の説明は無意味だった。

tbd

Her explanation of the problem made no sense.

Her explanation of the problem added up to nonsense.

Her explanation of the problem was nonsense.

彼らは皆、それが無意味だといった。

tbd

They all termed it nonsense.

常識のない知識は全く無意味だ、と私は思う。

tbd

I think that knowledge without common sense counts for nothing.

科学技術は人類に奉仕しなければ、それ自体では無意味である。

tbd

Technology is in itself meaningless unless it serves mankind.

だが俺はお前のとって永遠に無意味なまま。

tbd

But for you I'll always be insignificant.

そんなことをしても無意味だ。

tbd

It's nonsense to try that.

それはまったく無意味だ。

tbd

That's quite meaningless.

这毫无意义。