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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(shè)，即在定義為t=0的開始時(shí)間內(nèi)，所有變量均為零值。
Zero time	零時(shí)	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(yīng)力松弛試驗(yàn)中初始獲得給定載荷或約束條件的時(shí)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(fù)合材料	(ZTA composites) Ceramic composites based on aluminium oxide to which zirconium oxide is added, resulting in improved fracture toughness. （ZTA復(fù)合材料）基于氧化鋁的陶瓷復(fù)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(qū)域熔煉（區(qū)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(gè)狹窄的熔融區(qū)沿材料長(zhǎng)度移動(dòng)，導(dǎo)致雜質(zhì)在一端分離。