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1.the limits of ...的范圍
For this to happen, you must plan truthfully and avoid planning beyond the limits of your understanding.
要做到這點，您必須真實地規劃，避免規劃超出您能理解的范圍。
2.no longer necessary 不再必要
Similarly, it is no longer necessary to kill whales to work out what they have been eating, as this can be determined from DNA in samples of faeces.
同樣的，現在也沒有必要以殺死鯨魚的方式來了解鯨魚的攝食習性，因為這可從鯨魚的糞便樣本里的DNA中得知。
