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precarious [precarious 词源字典]: precarious: [17] Precarious comes from Latin precārius (source also of English prayer), which meant ‘obtained by asking or praying’. It was originally used in English as a legal term, in which ‘obtained by asking’ had undergone a slight change in focus to ‘held through the favour of another’. This introduced the notion that the favour might be withdrawn, and that the possession was therefore uncertain, and so the adjective soon came to be used for ‘depending on chance or caprice’ and, in the 18th century, ‘risky’.

Latin precārius was derived from prex ‘prayer’, a close relative of precārī ‘ask, entreat, pray’, from which English gets pray.
=> pray[precarious etymology, precarious origin, 英语词源]
abstract (adj.): late 14c., originally in grammar (of nouns), from Latin abstractus "drawn away," past participle of abstrahere "to drag away, detach, pull away, divert;" also figuratively, from ab(s)- "away" (see ab-) + trahere "draw" (see tract (n.1)).

Meaning "withdrawn or separated from material objects or practical matters" is from mid-15c. That of "difficult to understand, abstruse" is from c. 1400. Specifically in reference to modern art, it dates from 1914; abstract expressionism as an American-based uninhibited approach to art exemplified by Jackson Pollock is from 1952, but the term itself had been used in the 1920s of Kandinsky and others.
Oswald Herzog, in an article on "Der Abstrakte Expressionismus" (Sturm, heft 50, 1919) gives us a statement which with equal felicity may be applied to the artistic attitude of the Dadaists. "Abstract Expressionism is perfect Expressionism," he writes. "It is pure creation. It casts spiritual processes into a corporeal mould. It does not borrow objects from the real world; it creates its own objects .... The abstract reveals the will of the artist; it becomes expression. ..." [William A. Drake, "The Life and Deeds of Dada," 1922]

Then, that art we have called "abstract" for want of any possible descriptive term, with which we have been patient, and, even, appreciative, getting high stimulation by the new Guggenheim "non-objective" Art Museum, is reflected in our examples of "surrealism," "dadaism," and what-not, to assert our acquaintance in every art, fine or other. [Report of the Art Reference Department of Pratt Institute Free Library for year ending June 30, 1937]
redoubt (n.): also redout, "small, enclosed military work," c. 1600, from French redoute (17c.), from Italian ridotto, earlier ridotta, "place of retreat," from Medieval Latin reductus "place of refuge, retreat," noun use of past participle of reducere "to lead or bring back" (see reduce). The -b- was added by influence of unrelated English redoubt (v.) "to dread, fear" (see redoubtable). As an adjective, Latin reductus meant "withdrawn, retired; remote, distant."
secret (n.): late 14c., from Latin secretus "set apart, withdrawn; hidden, concealed, private," past participle of secernere "to set apart, part, divide; exclude," from se- "without, apart," properly "on one's own" (see se-) + cernere "separate" (see crisis).

As an adjective from late 14c., from French secret, adjective use of noun. Open secret is from 1828. Secret agent first recorded 1715; secret service is from 1737; secret weapon is from 1936.
Thalidomide (n.): 1958, from "phthalimidoglutarimide," based on abbreviated form of naphthalene; a morning-sickness drug responsible for severe birth defects in Europe from 1956 to 1961, when it was withdrawn. It never was approved for use in America thanks to the efforts of Dr. Helen Brooke Taussig (1898-1986). Thalidomide baby is attested from 1962.
withdraw (v.): early 13c. (transitive), "to take back," from with "away" + drawen "to draw," possibly a loan-translation of Latin retrahere "to retract." Intransitive sense from mid-13c. Sense of "to remove oneself" is recorded from c. 1300. Related: Withdrawn; withdrawing.