The pine tree explained that the birds were getting water from the cactus.
松树解释说，鸟儿是在仙人掌上取水的。
Tritiated water was used as tracer to measure tree transpiration in a 28-year old Chinese pine plantation of north China during the growing season of 1984.
于1984年生长季，利用氚水作为示踪剂对河北隆化碱房乡大水泉村西山28年生油松人工林树木蒸腾进行了测定。
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