Bulk drug的用法和样例：
例句
- However, some aseptic bulk operations still utilize considerable operator involvement which requires adequate controls.
然而，一些的无菌原料药操作仍需要相当的操作者牵涉在内，这需要充分的控制。 - However, drug substances from different suppliers may have different impurity profiles that are not addressed by the compendial test procedure.
然而，不同供应商的原料药可能有不同的杂质情况，这些未用药典方法进行叙述。
