The kind and content of carbon in CCmold flux should be carefully selected before preparation.
在制作保护渣时，碳粉的种类和加入量是应注意的重要因素。
Sample timing, frequency, and location should be carefully selected based upon their relationship to the operation performed.
根据与所进行操作的联系，选定样品周期、频率与位置。
The knee replacement system is an effective method to treat bone tumors near the knee, but the operative indication should be carefully selected.
可旋转铰链式膝关节置换膝关节肿瘤病人是一种有效的保肢方法，但选择适应证应慎重。
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