Recent censuses have shown thatcompared with the earlier years, the trees are packing on weight at anadditional two tons per acre annually.
最近的普查表明，通过于早些年的对比，这些树木每年要多增重2吨。
Recent censuses have shown thatcompared with the earlier years, the trees are packing on weight at anadditional two tons per acre annually.
最近的普查表明，通过于早些年的对比，这些树木每年要多增重2吨。
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