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Dolphins use echolocation to navigate through dark ocean waters, producing high-frequency sounds that bounce off objects. This remarkable ability allows them to locate prey and communicate with other dolphins across several kilometers of ocean depth.

CODIS is a Combined DNA Index System that helps law enforcement agencies identify suspects and missing persons. It contains multiple databases that can be searched simultaneously, making it an essential tool for solving cases across jurisdictions.

昨日下午，退伍军人李明在公交车上发现一位老人突发心脏病。他立即施以援手，进行心肺复苏，坚持到救护车到达。老人已转危为安，家属专程送来锦旗表示感谢。李明说："这是每个公民应尽的责任。"

The tension rises as Doctor Chen presents his credentials. Missus Thompson interrupts, questioning his experience. The judge maintains order, reminding everyone about courtroom etiquette. Doctor Chen remains composed, methodically addressing each concern while maintaining eye contact.

The cheetah's tail acts as a crucial counterbalance during high-speed pursuits, allowing them to make sharp turns while maintaining stability. This remarkable adaptation, combined with their flexible spine, enables them to reach speeds of up to 70 miles per hour.

Tabla. This pair of drums is fundamental to North Indian classical music. The right drum, called dayan, produces sharp sounds, while the left drum, bayan, creates deeper bass tones. Musicians strike different parts of the drumhead with varying finger techniques to produce distinct bols.

Level 5, tetrachromacy, one in 50 people. A mutation in the X chromosome grants a fourth cone cell in the retina, allowing the eye to perceive one hundred million colors invisible to the human eye. This biological upgrade transforms ordinary vision into a multidimensional spectrum of light.

哥哥姐姐们早上好呀！我刚吃完早饭，准备去上学了。今天要考试，我都复习好了。等放学回来跟大家说考得怎么样，大家要给我加油哦！