He explained in detail about the structure of the sphenoid bone.

This butterfly valve is used to control the flow of fluid.

He remembered the proverb 'even a pig will climb a tree if flattered', and complimented his boss.

After he solved the problem, he said, 'It's like seeing the true form of a ghost or a withered silver grass,' meaning things are not as scary as they seem.

This shape is a parallelogram.

This shape is a parallelogram.

Thinking sensibly, that plan will not succeed.

This is a preliminary plan.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.