acting chief engineer 代理轮机长
But health ministries, acting alone, cannot re-engineer societies in ways that protect entire populations from the well-known and easily modified risks that lead to these diseases.
然而，卫生部门单凭一己之力无法重塑社会，保护全民免受广为人知并可轻易改变的致病危险带来的侵扰。
When calculating the wind loads acting on a railway bridge, an engineer assumes that the wind will act in a horizontal direction. It doesn't always, of course.
当计算铁道桥梁上风荷载时，工程师假定风力沿水平方向作用。当然也不总是这样。
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