必需元素 indispensable element
- 形态与浓度不同的硒化合物可能是生物体的必需元素,同时也可能导致中毒。
Different concentrations or different species of selenium may be essential or toxic for organism. - 钠:在所有陆生植物中均能发现的一种化学元素。除了一些耐盐C4植物,钠对其余大多数并非必需元素。
Sodium An element found in all terrestrial plants, although it is believed not to be essential in most, with the exception of some salt-tolerant C4 plants. - 整个事情就象是PBS的电视系列,可以叫做“寻找失落的长城”里面包含了必需元素----惊险刺激。
The whole thing seemed like some kind of PBS TV series, maybe called "Looking for the Great Wall." It seemed to have the requisite elements of surprise, danger and excitement.
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