可获得性说（Availability Theory）亦称存在性理论。
“由于有这么多的未知问题和这么多的已有数据，这些数据的可获得性将确实非常重要，”NASA的Jason Kessler说。
"Because there is so much unknown and there is so much data out there, it's going to be really important that the data is accessible," said Jason Kessler of NASA.
所有白皮书作者能让我为在在阿姆斯特丹下个月内的野餐06点说知道他们的可获得性吗？
Please could all whitepaper authors let me know their availability for speaking at PICNIC06 in Amsterdam next month?
作者们说，草甘膦除草剂的毒性有益于土壤生物进一步减少对植物对抗病害所需的养分的可获得性。
The authors said that glyphosate's toxicity to beneficial soil organisms further reduces the availability of nutrients that are critical for a plant's defense against disease.
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