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ark [ark 词源字典]: ark: [OE] The notion underlying ark seems to be that of ‘enclosing or defending a space’. Its ultimate Latin source, arca ‘large box or chest’, was related to arx ‘citadel’ and to arcēre ‘close up’ (from which English gets arcane). Arca was borrowed into prehistoric Germanic, and came into English as ærc. In addition to meaning ‘chest’ (a sense which had largely died out by the 18th century), it signified the ‘coffer in which the ancient Hebrews kept the tablets of the Ten Commandments’ – the Ark of the Covenant – and by extension, the large commodious vessel in which Noah escaped the Flood.
=> arcane, exercise[ark etymology, ark origin, 英语词源]
commandments (n.): short for The Ten Commandments, attested from late 13c. In Old English they were ða bebodu.
Decalogue (n.): "Ten Commandments," late 14c., from Middle French decalogue, from Latin decalogus, from Greek, from the phrase hoi deka logoi used to translate "Ten Commandments" in Septuagint.
testimony (n.): c. 1400, "proof or demonstration of some fact, evidence, piece of evidence;" early 15c., "legal testimony, sworn statement of a witness," from Old North French testimonie (Old French testimoine 11c.), from Latin testimonium "evidence, proof, witness, attestation," from testis "a witness, one who attests" (see testament) + -monium, suffix signifying action, state, condition. Despite the common modern assertion, the sense of the word is unlikely to have anything to do with testicles (see testis).

Earliest attested sense in English is "the Ten Commandments" (late 14c.), from Vulgate use of Late Latin testimonium, along with Greek to martyrion (Septuagint), translations of Hebrew 'eduth "attestation, testimony" (of the Decalogue), from 'ed "witness."