英和和英

hard training

the act of studying despite many hardships

Study as hard as one can

indefatigable industry

harsh training

to seriously work hard

drink hard

to grind away―hammer away―peg away―plod away―pound away―（at English）

dauntingly difficult

Hard training

impressively difficult

endure the severe training

hard dealing

to strain one's powers―stretch one's powers―make violent efforts

perspire heavily

Study hard.

I will work with all my might―with might and main.

dash desperately

very difficult

hammer (away) at one's studies

a difficult weld

to work with all one's heart and soul

get by trying hard

extremely difficult

think hard

Do your study.

to do one's level best

a severe trial

try hard

to think hard about a difficulty