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Tổ chức Baccalaureate Quốc tế · IB Diploma · Environmental Systems and Societies · HL Chủ đề 8 1:08 Giọng đọc tiếng Anh · phụ đề tiếng Anh + 中文 được ghi trực tiếp
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These are selected topics, not the whole syllabus, and every example is fictional.
这些是精选主题，不是完整大纲，所有例子都是虚构的。
Population change has four flows, and an indicator measures one specified thing.
人口变化有四股流量，指标只衡量一个特定方面。
A city of 10,000 people records births 150, deaths 100, immigration 300 and emigration 200 in a year.
一座 10,000 人的城市一年内出生 150、死亡 100、迁入 300、迁出 200。
Add the flows in and subtract the flows out: a change of 150, which is 1.5 percent.
加上流入、减去流出：变化 150，即 1.5%。
Births and deaths alone would give 50: migration does most of the growth here.
只看出生和死亡只有 50：这里大部分增长来自迁移。
A sustainability indicator measures one specified feature, not total wellbeing.
可持续性指标只衡量一个特定方面，而不是整体福祉。
Suppose 80 percent of a city's homes have piped water on average.
假设一座城市平均 80% 的住户有自来水。
District by district, two are at 95 and 90 percent, but one is at 55.
分区来看，两个区是 95% 和 90%，但有一个区只有 55%。
The average hides unequal access to services.
平均数掩盖了服务获取的不平等。
Check yourself.
自我检测。
40 out of 2,000 is 2 percent growth.
2,000 人增加 40，增长 2%。
The change is 50, which is 1 percent of 5,000.
变化 50，是 5,000 的 1%。