One is food security， another is climate change and the third is the threat of a worldwide outbreak of influenza. 其一是食品安全问题，另一个是气候变化，第三是流行感冒全球性爆发的威胁。
#头条创作挑战赛#ONE vs ONESWe can use ONE to replace a countable noun in the singular and ONES to replace a countable noun in the plural because we
