1. Plum blossoms have a tenacious will to bloom in the cold season; bamboos have a noble spirit and can stand tall.

2. The stream is brave, not afraid of the obstacles of mountains, not afraid of the rugged road underfoot, and bravely moves forward; the tree is strong, not afraid of the blows of violent storms, not afraid of the torture of severe cold and heat, and stands tall and straight. The lighthouse is fearless. It is not afraid of endless darkness. It is not afraid of years of loneliness.

3. Maternal love is a ray of sunshine that makes your heart feel as warm as spring even in the cold winter; maternal love is a clear spring that keeps your feelings pure even in the dust of the years. clean. Mother's love is a breeze that can restore your mood to clear skies even if it is shrouded in gloom.

Extended information:

In order to understand the nature of a certain thing, many ancient scientists often made qualitative analogies between the thing and known things, that is, they have many similarities. properties, thus inferring that these two things have other similar properties.

For example, in order to understand the propagation of sound, the ancient Chinese scientist Song Yingxing wrote in "On Qi": "Motive force: the energy of things, such as the energy of water. When a stone enters water, water meets a stone, it punches When it stops, its waves spread out when the time comes, and it continues to search for text vertically and horizontally, and the same is true of its swinging energy."

Here, Song Yingxing made an analogy between the sound of hitting and the ripples of a stone thrown into water. Since water travels in the form of waves, sound can also travel in the form of waves. Song Yingxing used a qualitative analogy here to deduce that sound propagates in the form of waves in the air.