ーI didn't really understand what he was saying, but I could tell he was a really good player.
「彼の言っていることはよくわからなかったけど、彼がすごく良いプレーヤーだということはわかった」
I could tell he was a really good player. を使ってゲームスキルが高いことを表現できます。
ーI wasn't familiar with the language he was using, but it was obvious he was quite skilled.
「彼の言語には馴染みがないけど、彼がすごく腕がいいのはすぐにわかった」
スキルという言葉を使うなら、It was obvious he was quite skilled. を使って表現できます。
obvious で「すぐにわかる・明白な」
skilled で「熟練した・腕のいい」
ご参考まで！
I can tell that his gaming skills are high, even though I don’t understand his language.
「◯◯が分かる」は **"I can tell that ~"** や **"I can see that ~"** で表現できます。
- **"I can tell that his gaming skills are high."** → 直感的に「分かる」ニュアンス。
- **"I can see that he’s really skilled at gaming."** → 見て明らかに分かるという意味。
「ゲームスキル」は **"gaming skills"** または **"he is a skilled gamer"** でもOK。
カナダ 
アメリカ合衆国 
