A menstrual cup is one of the environmentally friendly and economical menstrual products.

His blood is always flowing hot.

This room is always kept clean.

Essential fatty acids are vital nutrients for our health.

Essential amino acids cannot be produced by the human body, so they need to be obtained from the diet.

He and I are related by blood.

He fractured his intermediate cuneiform bone in his foot.

Essential fatty acids are important nutrients for our health.

Essential amino acids, which the human body cannot produce on its own, need to be obtained from the diet.

Essential amino acids are necessary to be taken from our diet because our body cannot produce them on its own.