This shape is called a muoctahedron, in other words, a hexagonal four-piece square hole twisted polyhedron.

He was lying face-up, looking at the stars.

My high school has very strict rules.

His filial piety towards his parents is wonderful.

He is truly a dutiful son to his parents.

He visits his parents' house every weekend for filial piety.

The technology of artificial rainmaking greatly contributes to agriculture in arid regions.

She successfully made her high school debut.

My grandmother really likes Tsushima's specialty, the Tsushima sweet potato.

The photoelectric effect is a phenomenon where a material emits electrons after absorbing light.