1. essential elements of agrometeorology 
   农业气象要素
2. essential elements of plant 
   植物必需元素
3. the primary form of thrombocytopenia (rather than a shortage of platelets caused by with other conditions such as tuberculosis or chemical suppression of bone marrow etc.). 
   血小板减少的基本形式。
4. An essential bodily fluid. 
   体液体内所必需的液体
5. essential equality and interchangeability. 
   价值相等，可以互换。

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