async function peekFirstChunk(stream) {
政府在現金回購之外，亦提出居民可「先出售業權、再購置居屋」或「樓換樓」選項，當中羅列各居屋及綠置居現有項目的預計入伙時間及平均售價，當中九龍灣的項目屬最早，預計今年9月可入伙。
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* @param {string} num 非负整数的字符串形式（可能含前导零）
2. 分区：小于pivot的放左边，大于的放右边
Resident doctors also have little control on where and when they are asked to work, and say that the need to do placements in different parts of the country can be expensive.