YOU SAID:

How can this happen given that we've been so careful about it?

INTO JAPANESE

私たちがそれについて非常に注意を払ってきたのに、どうしてこれが起こるのでしょうか?

BACK INTO ENGLISH

We've been paying so much attention to it, so why does this happen?

INTO JAPANESE

私たちはそれにとても注意を払ってきましたが、なぜこれが起こるのですか?

BACK INTO ENGLISH

We've been paying so much attention to it, but why does this happen?

INTO JAPANESE

私たちはそれに多くの注意を払ってきましたが、なぜこれが起こるのですか?

BACK INTO ENGLISH

We've paid a lot of attention to it, but why does this happen?

INTO JAPANESE

私たちはそれに多くの注意を払ってきましたが、なぜこれが起こるのですか?

BACK INTO ENGLISH

We've paid a lot of attention to it, but why does this happen?