分析家称莫斯科和基辅之间爆发另一场恶性天然气斗争的可能性非常大，而这会中断对欧盟的输送。
Analysts say that there is a strong probability of another damaging gas war between Moscow and Kiev, which could halt deliveries to the EU.
他们发现环状结构的特点是，无论叶片的哪一部分供给机制被中断，其余部分都有能力输送水和养分。
They found the loops are structured in such a way that no matter which piece of a leaf’s supply mechanism is disrupted, there is usually enough capacity in the rest to distribute water and nutrients.
俄罗斯1月15日忽然决定中断几乎所有经乌克兰输送到欧盟国家的天然气供应至今，问题陡然严重起来，招致欧洲更直接的干预。
Yet Russia’s abrupt decision on January 5th to cut off almost all the gas it supplies to EU countries via Ukraine has sharply raised the stakes, inviting the Europeans to intervene more directly.
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