This is called empty love. The theory described by Robert Sternberg, called the Triangular Theory of Love, indicates that love can have 3 components: intimacy, passion and decision /commitment.
The intimacy component refers to feelings of connection, closeness, and union in sentimental relationships. The component of passion refers to romantic impulses, physical attractiveness, and sexual intercourse.
The decision /commitment component refers first to the decision to love someone, and then to the decision to keep that commitment. This component is also called empty love.
Crucian carp have the ability to increase gill surface to maximize oxygen intake, or reduce overall area when under specif circumstances. If the fish does not need so much oxygen it will cover the protruding lamellae to reduce oxygen intake and avoid Hyper-oxygenation.
The second note of Secretary of State Hay's Open Door policy with China addressed Japan's invasion of China. The second note of Secretary of State Hay's Open Door policy also known as Hay's second policy was aimed at preserve China's territorial and administrative integrity during the Sino-Japanese War.