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1. The construction workers were busy mixing cement to prepare the foundation for the new building.
建筑工人正在忙着混合水泥，为新大楼的地基做准备。
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2. The contractor was instructed to mix the concrete thoroughly before pouring it into the formwork.
承包商被指示在倒入模板之前彻底混合混凝土。
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3. The engineer had to juggle the schedule and ensure that the construction progressed smoothly.
工程师必须同时处理时间表和确保施工顺利进行。