Secondary in abundance are aromatic sester and sesquiterpenoid hydrocarbons,but aromatic diterpenoids, most of the regular PAH are found at trace levels only.
但芳香二萜类,大多数常规多环芳烃仅以微量形式存在。
单词 | trace level |
释义 |
trace level
英语例句库
Secondary in abundance are aromatic sester and sesquiterpenoid hydrocarbons,but aromatic diterpenoids, most of the regular PAH are found at trace levels only. 但芳香二萜类,大多数常规多环芳烃仅以微量形式存在。
原声例句
PBS趣味科普 But maybe most importantly, we can trace changing levels of carbon dioxide. 但也许最重要的是,我们可以追踪二氧化碳含量的变化。 PBS趣味科普 We've only been measuring carbon dioxide in the atmosphere since 1957, but using the data from ice cores, we can trace levels back way way farther. 自 1957 年以来,我们只测量了大气中的二氧化碳,但是利用冰芯的数据,我们可以追溯到更远的地方。 |
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