Rulers, also known as rulers and scales, are tools for drawing line segments (especially straight lines) and measuring length. There are usually scales on the ruler to measure the length. Some rulers have holes with special shapes, such as letters or circles, which are convenient for users to draw. They are usually used to measure and calculate the length, and are generally divided into tape measure, vernier caliper, ruler and ruler.
"Snake ruler" is a ruler specially used to draw curves. Triangular ruler is a ruler of right triangle or isosceles triangle, which is convenient for drawing parallel lines or vertical lines. Slide rule: a calculating tool. Soft ruler: it is often used to measure human body parts. Ruler: used to measure buildings, furniture, etc. Vernier caliper: used to measure smaller things. In ruler drawing, ruler is regarded as a tool for drawing infinite straight lines. Level: Level is a measuring instrument that uses the principle of liquid level to directly display the angular displacement and measure the deviation degree of the measured surface relative to the horizontal position, vertical position and inclined position.
The literary connotation of songs mainly refers to the literary factors of songs, and the common form is poetry. The content of poetry, including the way of narration, will greatly affect the formation of song style. For example, "Yang-Bian-Ge" and "Yang-Bian-Ge" in poetry will affect the beginning of the song; The "parallelism" and "symmetrical structure" in poetry will also affect the musical moments of songs and the writing characteristics of festivals, thus forming the "square" and "square" structures of songs; The segmentation of poetry will also directly or indirectly affect the number of paragraphs in the song. Besides the influence of form, the content of poetry is the decisive factor. It is hard to imagine that the lyrics of Ode to the Yellow River will become light music; The famous drinking song in the opera La Traviata will be written as a dignified and slow bass solo. Songs also have their own characteristics, short length and limited range, which must be completed in three to five minutes. Therefore, it is a direct reflection of a writer's subjective feelings, just like essays and personal experiences in literature. Composers reflect their life, experiences, encounters, joys and sorrows from a personal perspective when composing music. Schubert has the reputation of "the king of songs", and his immortal masterpieces "The Beautiful Mill Girl" and "A Winter's Journey" all choose the poems of the romantic poet Miao Sai. Miao Sai can't be said to be the leading poet in Europe. But it is his poems that reflect the composer's life philosophy and present situation, and touch the composer's heartstrings on the point of "lonely tramp", and then condense into a melody that lasts forever.