But the method of mixing anti freeze and pumping aid together into concrete is not advisable, and the scientific technology is using anti freezing pumping aid in concrete.
但采用双掺防冻剂和泵送剂的方法不可取，科学合理的方法是采用防冻泵送剂。
Heart assist devices are mechanical pumps that aid in the pumping action of a weakened heart.
心脏辅助泵装置是针对心率弱的病人。
Heart assist devices are mechanical pumps that aid in the pumping action of a weakened heart.
心脏辅助泵装置是针对心率弱的病人。
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