これは弁護士同士の話なので勝手に入って来ないで下さい。
This is a conversation between lawyers, so please don't barge in.
それは兄弟同士の問題でしょ？私を巻き込まないで。
That is an issue between siblings, isn't it? Don't pull me into it.
お互い大人同士なんだから、落ち着いて話し合おうよ。
We are fellow adults, so let's calm down and talk about this.
あなたたちは本当に似たもの同士ね。
You guys are really similar (in personality).
家族同士で会話をするときはほとんど日本語です。
When we talk between family members, we mostly use Japanese.
彼は友達同士の約束を破った。
He broke a promise that was made between friends.
負けた者同士で飲みに行こうよ！
Let's go out for drinks as fellow losers!
中学生同士は結婚するには若すぎる。
Middle schoolers are too young to marry (each other).
同級生同士だから、助け合わなきゃね。
We are fellow classmates, so we have to help one another, right?
友達同士の約束だったのに彼は破った。
Even though it was a promise among friends, he broke it.
キリンは雄同士が喧嘩をする時互いに長い首で打ち合う。
When male giraffes fight among themselves they hit each other with their long necks.
そのため、日本の企業同士の協力が以前よりも必要だ。
Because of that, cooperation among Japanese companies is needed more than before.
「だって」は家族や友達同士などで使う、くだけた表現なので、上司などとの話し合いのときは使わないでください。
'だって' is an informal expression used among family and friends, therefore please do not use it when discussing with superiors and the like.
弟同士の喧嘩を、おもちゃなどでよく止めたものだ。
I often used to stop my little brothers' fights with toys and things.
似た音楽が好きな者同士は仲良くなるのがはやい。
People who share mutual taste in music have no trouble getting to know each other.
幼馴染同士の結婚はうまくいかない場合もある。
There are also cases when marriages between childhood friends do not go well.
インターネットへのアクセスが広がるにつれて、プレイヤー同士で競い合うオンラインゲームが人気になってきた。
As access to the internet spread, online games, where players could compete with one another, started to gain popularity.
この糊は紙同士だとよくくっつきますがプラスチック同士だとあまりくっつかないです。
This glue sticks paper to paper well, but not plastic to plastic.
プロの格闘家同士の戦いは見ていて楽しい。
Watching professional fighters go against each other is fun.