頑張(がんば)り屋(や)someone who battles on in difficult circumstances

先生(せんせい)は頑張(がんば)り屋(や)な生徒(せいと)が好(す)きだ。

The teacher likes students who battle on in difficult circumstances. {someone who battles on in difficult circumstances}

僕(ぼく)は頑張(がんば)り屋(や)な社員(しゃいん)に昇進(しょうしん)して欲(ほ)しいです。

I want the employee who battles on in difficult circumstances to get promoted. {someone who battles on in difficult circumstances}

娘(むすめ)は頑張(がんば)り屋(や)なので、いずれ成功(せいこう)者(しゃ)になるでしょう。

My daughter is someone who battles on in difficult circumstances, so she will eventually become successful. {someone who battles on in difficult circumstances}

頑張(がんば)り屋(や)の生徒(せいと)が低(ひく)い点数(てんすう)を取(と)った時(とき)、苦(くる)しい気持(きも)ちになった。

When the student who battles on in difficult circumstances received a low score, they felt distressed. {someone who battles on in difficult circumstances}

僕(ぼく)の取(と)り柄(え)は頑張(がんば)り屋(や)なので、小(ちい)さい事(こと)にも手(て)を抜(ぬ)くわけにはいきません。

My strength lies in being someone who battles on in difficult circumstances, so I cannot afford to cut corners, even for small matters. {someone who battles on in difficult circumstances}