| 释义 |
▪ I. ˈmultistage, a.
Also multi-stage.
[f. multi- 3 + stage n.]
Consisting of, occurring in, or involving several stages (cf. stage n. IV).
1904Engineering News LI. 324/3 The pumps shown and described in the following are multi-stage turbine pumps. 1911A. M. Greene Pumping Machinery xiii. 522 (heading) Multi-stage compression. 1920Wireless World Jan. 574/2 (heading) The design of multi-stage amplifiers using three-electrode thermionic valves. 1944[see intercool vb. s.v. intercooling vbl. n.]. 1946Nature 5 Oct. 464/2 It was admitted that these ranges might be attained by the employment of multi-stage rockets. 1962F. I. Ordway et al. Basic Astronautics x. 400 Large boosters..are being designed for use as the initial stage of a multistage space carrier vehicle. 1962Simpson & Richards Physical Princ. Junction Transistors xi. 246 We shall be concerned with typical intermediate stages in a multistage amplifier and not with unusual impedance matching arrangements at the input and output. 1963R. R. A. Higham Handbk. Papermaking vi. 139 Either single- or multi⁓stage bleaching may be carried out according to the conditions. 1971Brit. Med. Bull. XXVII. 68/2 Multi-centric hypotheses [of the origin of cancer] have not proved as popular as multi-stage hypotheses, or theories which assume that a change from a normal cell to a malignant cell takes place in stages. 1971B. Scharf Engin. & its Lang. xv. 207 Multi-stage turbines may be compound, i.e. they have both impulse and reaction stages.
b. spec. in Statistics. Applied to sampling carried out in a number of stages, the sample obtained at each stage being divided into smaller units and taken as the population for the next stage of sampling.
1949F. Yates Sampling Methods for Censuses & Surveys iii. 34 Multi-stage sampling introduces a flexibility into sampling which is lacking in the simpler methods. 1966Kendall & Stuart Advanced Theory Statistics III. xxxix. 204 The motive for multi-stage sampling is almost invariably to reduce costs rather than reduce variance directly; the additional resources can, of course, be applied to an increase in sample size. 1973F. E. Fischer Fund. Statistical Concepts ix. 215 The extensive survey work which precedes every national election..is a perfect example of multistage sampling.
So ˈmultistaged ppl. a. [multi- 1].
1965Times Lit. Suppl. 25 Nov. 1051/1 It is like a Greek tragedy in which the Furies have been replaced by a multi-staged rocket.
▪ II. multiˈstage, v.
Also mulˈtistage.
[f. prec.]
trans. To make multistaged. So multiˈstaging vbl. n., the use of several stages.
1911A. M. Greene Pumping Machinery xiii. 523 Since it is not possible to bring the curve of compression close enough to the isothermal, a method of multi-staging the compression has to be devised. 1944A. H. Church Centrifugal Pumps & Blowers vi. 128 If the total head to be developed by a pump is too large for a single stage to handle, multistaging is resorted to. 1972Physics Bull. Oct. 591/2 In general one would like a higher overall pressure ratio and this can be obtained by multistaging. |