Lu Meng, a prominent figure in the Three Kingdoms period of Chinese history, is often depicted as speaking in a calm and composed tone. This portrayal is consistent with the historical context and the character's role as a military strategist and advisor to the warlord Sun Quan. The tone of Lu Meng's speech is reflective of his demeanor, which was marked by wisdom, caution, and a strong sense of loyalty.

The calm and composed tone of Lu Meng's speech can be attributed to several factors. Firstly, as a military strategist, Lu Meng was well-versed in the art of war and diplomacy. His speeches were designed to convey complex strategies and plans in a manner that was both clear and persuasive. This required a level of precision and clarity that could only be achieved through a calm and measured tone.

Secondly, Lu Meng's loyalty to Sun Quan was unwavering. His speeches were often aimed at reinforcing this loyalty and ensuring that Sun Quan's interests were protected. A calm and composed tone was necessary to maintain the respect and trust of his superior, as well as to inspire confidence in his fellow advisors and soldiers.

Historical texts, such as the "Records of the Three Kingdoms" by Chen Shou, provide insights into the nature of Lu Meng's speech. Chen Shou describes Lu Meng as a "wise and prudent" individual, which is reflected in his demeanor and communication style. For example, when Lu Meng advised Sun Quan on the best course of action during the Battle of Red Cliffs, his tone was measured and thoughtful, emphasizing the importance of strategic planning and preparation.

Furthermore, the historical context of the Three Kingdoms period also supports the portrayal of Lu Meng as a calm and composed speaker. The era was characterized by political intrigue, military conflict, and a constant need for strategic planning. In such a volatile environment, a calm and composed tone was essential for maintaining stability and conveying authority.

In conclusion, Lu Meng's tone of speech was calm and composed, reflecting his role as a military strategist and his unwavering loyalty to Sun Quan. This tone was necessary for conveying complex strategies, reinforcing loyalty, and maintaining authority in a period marked by political and military turmoil. Historical texts and the character's portrayal in the "Records of the Three Kingdoms" provide evidence of this calm and composed demeanor.