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詞或詞組	中文	英文解釋中文解釋
Zero initial conditions	零初始條件	The assumption normally made in control engineering that up to a start time defined as t = 0, all variables have zero value. 在控制工程中通常作出的假設，即在定義為t=0的開始時間內，所有變量均為零值。
Zero time	零時	The time when the given loading or constraint conditions are initially obtained in creep or stressrelaxation tests, respectively. 分別在蠕變或應力松弛試驗中初始獲得給定載荷或約束條件的時間。
Zero-gravity	零重力	The situation in which there is no force of gravity (i.e. weightlessness). 沒有重力的情況（即失重）。
Zirconia-toughened alumina composites	氧化鋯增韌氧化鋁復合材料	(ZTA composites) Ceramic composites based on aluminium oxide to which zirconium oxide is added, resulting in improved fracture toughness. （ZTA復合材料）基于氧化鋁的陶瓷復合材料，其中添加了氧化鋯，從而提高了斷裂韌性。
Zone melting (zone refining)	區域熔煉（區域精煉）	A process of purification of materials in which a narrow molten zone is moved along the length of the material, resulting in impurities being segregated at one end. 一種凈化材料的過程，其中一個狹窄的熔融區沿材料長度移動，導致雜質在一端分離。