Bài 14 - Phần 2

The idiom "piece of cake" is used to describe something as very easy or simple to accomplish. It likely originated from the idea that eating a piece of cake is enjoyable and requires little effort. The phrase has been in use in English since the early 20th century and has become a popular way to express how easy a task is.

The idiom "the last straw" is used to describe a situation or event that becomes the final and decisive factor leading to a particular outcome, often a negative or breaking point. It originates from the proverbial expression "the straw that broke the camel's back," which refers to the idea that a camel can carry a heavy load, but adding one more straw will cause it to collapse.

The idiom "under the weather" has origins in the sailing world and dates back to the 18th century. It originated from sailors who would often feel sick or unwell due to rough weather conditions, which could cause them to feel unwell or seasick. The phrase evolved to describe someone who is feeling sick or not in good health. It is used to indicate that someone is feeling unwell or experiencing a mild illness. It suggests a temporary state of physical discomfort or sickness.

The origin of the idiom "ring a bell" is not tied to a specific historical reference, but it draws upon the sound of a bell as a metaphor for memory recall. Bells have long been used as signaling devices, and their distinctive sound can be associated with awakening or alerting someone to an event or information. It represents the act of a familiar sound triggering a recollection or recognition in one's memory. It is commonly used in conversations, discussions, or interactions where someone wants to determine if a particular piece of information or topic is familiar to the listener.

Mathematics is the study of numbers, quantities, shapes, and patterns. It includes various fields like arithmetic, algebra, geometry, and calculus, all of which are used to solve problems and explain relationships between different elements. Mathematics is essential in everyday life and is widely applied in areas such as science, engineering, economics, and technology.