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长贵说得对，快跟你爹道歉2. Straight signal: both hands stretch out horizontally and the right hand swing;Recently, the reporter came to the express service center in a university. Here, the reporter saw that the rows of express delivery shelves were already filled with various small packages early in the morning, and some large packages that were slightly larger and could not fit on the shelves were also spread all over the floor, but these were not all, and the staff were unloading the goods one after another. A courier said that there are usually 156 packages a day, and there are about 12,000 packages on the 13th and 14th after the "Double Eleven".Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:Deliberate practice includes well-defined specific goals and usually includes some aspects of goal performance. It does not point to some vague overall improvement.高中女生夏澄(深田恭子)，愛慕單身英俊的老師藤堂直(渡部篤郎)，同學清一(池內博之)卻對夏澄一往情深。而當藤堂克制不住自己的感情，與夏澄淡淡的一吻之後，卻忽然不知去向。五年後，夏澄的姊姊朋子(和久井映見)將男友帶回家時，夏澄赫然發現，姊姊的未婚夫竟是朝思暮想的初戀情人藤堂。故事就圍繞這四個人執著的愛開始展開…。2. Mathematical period: For a function f (x), if there is a non-zero constant T, so that when x takes every value in the domain, there is f (x + T) = f (x), then the function f (x) is called a periodic function. The nonzero constant T is called the period of this function.