He has a secret plan to solve the problem.

The tip of the pen has broken.

This algorithm was developed for optimization.

We need to optimize this process.

He milks the cows every morning.

I need to buy a new milking machine.

He is doing a special exercise to strengthen the subclavius muscle.

He likes to write gesaku.

The depletion of soil nutrients due to monocropping is becoming a problem.

He monocropped the land too much, and the soil became exhausted.