主要介绍了砷的基本性质及水环境中砷污染的来源、现状,阐述了砷及其化合物对环境和生物所造成的毒害。
This paper has given an analysis on where arsenic comes from, present pollution situation, and description of arsenic and its compounds' harmful effect on environment and life things.
“我们应该更仔细地去考虑可能对粮价和环境问题造成的影响,并且确保我们能对我们所支持的东西(生物能源)拥有更多的选择方案,”他说。
"We need to look more closely at the impact on food prices and the environment of different production methods and to ensure we are more selective in our support (for biofuels)," he said.
对达尔文来说,造成子代表型和父代表型存在差异的因素中,生物自身所起的唯一作用就是随机突变。
For Darwin, the only thing that organisms contribute to determining how next-generation phenotypes differ from parent-generation phenotypes is random variation.
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