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국제바칼로레이트 · IB Diploma · Environmental Systems and Societies · HL 주제 2 1:08 영어 내레이션 · 영어 + 중국어 자막 burned-in
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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。
Random quadrats estimate a population without choosing the answer.
随机样方在不预设答案的情况下估计种群。
Choose five quadrat positions with random numbers before visiting the field, so the richest patches cannot be picked.
在去现场之前用随机数选好五个样方的位置，这样就不会挑最茂盛的地块。
The five 0.25 square metre quadrats hold 3, 4, 6, 5 and 2 plants: a mean of 4.
五个 0.25 平方米样方内分别有 3、4、6、5、2 株：平均 4 株。
Density is 4 over 0.25, which is 16 plants per square metre, so about 1,600 in 100 square metres.
密度 = 4 ÷ 0.25 = 16 株/平方米，所以 100 平方米约 1,600 株。
In a food chain, each arrow shows the direction of energy transfer: from grass to rabbit, from rabbit to fox.
食物链中每个箭头表示能量传递的方向：从草到兔，从兔到狐。
It is not the direction a predator travels.
它不是捕食者移动的方向。
And quadrats suit organisms that do not move quickly, like the grass, not the fox.
样方适合不怎么移动的生物，比如草，而不是狐狸。
Check yourself.
自我检测。
A mean of 6 in half a square metre is 12 per square metre.
0.5 平方米平均 6 株，密度 12 株/平方米。
A mean of 5 in a quarter square metre is 20 per square metre.
0.25 平方米平均 5 株，密度 20 株/平方米。