This 'Ra' shirt is very light.

This dress is made of lightweight fabric, so it's very light.

This dress is made of lightweight fabric, so it's very light.

He climbed the tree as nimble as a cat.

This algorithm was developed for optimization.

We need to optimize this process.

It is difficult to find the optimal solution to this problem.

Her shirt with sleeves that are too long is very cute.

Her sleeves, which were too long for her, were swaying in the wind.

I have been to Ningxia.