音標 [ri(:)'ækʃən]
n. 名詞 1. 反作用,反應;反沖;反動力。
2. 【政治學】反動,倒退;復古(運動)。
3. 【化學】反應,【物理學】反應力,反作用力;【無線電】反饋,回授;反向輻射;【醫學】反應;副作用,後效應;(緊張興奮后的)無氣力,虛脫。
4. 【商業】猛跌。
5. 【軍事】反擊。


    1. The abstraction of elements from soil water by plant roots can have a marked effect on chemical reaction rates.

    2. The corresponding reaction of acetaldehyde is subject to general base catalysis.

    3. In this paper, ackerman steering linkage of double - wishbone suspension is taken as the study object, choosing the splitting joint and steering lever joint to carry out the design of optimization the mathematics models are established based on the multi - body system dynamics, applying its analysis method of kinematics to study the mechanism kinetic principles owing to more spatial factors considered, and calling off many hypotheses affecting the accuracy, compared with the traditional methods, the models are better to reflect the realistic motion principles, the results are more exact and applicable moreover, the force analysis is applied to the conduct mechanism the analysis method of dynamics in the multi - body dynamics is applied to study the forces applied on every component, working out the constraint reaction force of up and down ball joints, and developing the current computation program in the end, produce the upper wishbone geometry model in the ansys software package, meshing and carrying out the fea, testifying if the intensity of the wishbone meet with the requirements

    4. Polarographic determination of nitrite ion based on the nitrosation reaction with acridine red

    5. The expected adduct 100 was not stable and appeared to undergo further reaction to the spiro intermediate 101.