原文 http://tinyurl.com/kuznv97 The scientists noted the challenge in accessing data and creating metrics that can be compared across livestock and to potato, wheat and rice production. 请问the challenge in accessing data是什么意思? challenge是挑战 accessing是进入 翻成"在进入资料的挑战"@@? 跪求强者帮忙解惑 thx~