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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Biology · 术语表

什么是 Food chain？

又称： is eaten by · link

Definition 19.1 Primary & Middle School Biology · 第 19 章 — Food Chains

A food chain is a line of living things in which each one is eaten by the next. It is written with arrows, each arrow meaning “is eaten by”:

\text{grass} \longrightarrow \text{grasshopper} \longrightarrow \text{lizard} \longrightarrow \text{buzzard}.

Each living thing is a link of the chain.

The meadow chain’s last link on patrol: the buzzard’s afternoon depends, three links down, on how green the grass grew.

示例

Example 19.4 (Chains from three habitats)

In the pond: water plants $\rightarrow$ tadpole $\rightarrow$ dragonfly larva $\rightarrow$ stickleback $\rightarrow$ heron. In the forest: oak leaves $\rightarrow$ caterpillar $\rightarrow$ blue tit $\rightarrow$ sparrowhawk. In the garden: salad $\rightarrow$ snail $\rightarrow$ hedgehog. First link: always green.

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