Mysterious number：40 milliseconds (0.04 seconds)

Chinese race walker Liu Hong (劉虹) appears to have violated the rules during a race.

【明報專訊】There are numerous judges on the course to monitor the athletes to make sure that they comply with the rules. However, human eyes have their limitations. In reality, judges have difficulty confirming a violation of rules if both feet are in the air for less than 40 milliseconds.

■ Glossary

comply (v) 遵守

violation (n) 違反

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