Once precipitated, the sample was centrifuged and the supernatant was removed.
Once precipitated, the sample was centrifuged and the supernatant was removed.
如有沉淀，离心样品，出去上层漂浮物。
Once precipitated, the sample was centrifuged and the supernatant was removed.
如有沉淀，离心样品，出去上层漂浮物。