crateyoudaoicibaDictYouDict[crate 词源字典]
crate: [17] Crate is usually connected with Latin crātis ‘hurdle’, making it a relative of grate, griddle, and grill(e), and indeed an isolated example of crate in the early 16th century, which unequivocally means ‘hurdle’, certainly must come from that source. However, the main body of evidence for crate begins in the late 17th century, and its meaning, ‘large case or box’, is sufficiently far from ‘hurdle’ to raise doubts about its origins. Another possible source that has been suggested is Dutch krat ‘basket’.
=> grate, griddle, grill[crate etymology, crate origin, 英语词源]
elkyoudaoicibaDictYouDict
elk: [OE] The Indo-European base *ol-, *elproduced a number of names for deerlike animals – Greek élaphos ‘stag’, for example, and Welsh elain ‘hind’, not to mention English eland. In its Germanic descendants, two main lines of development are evident: its extensions *olk- and *elk- produced respectively Germanic *algiz (whence Old Norse elgr) and Germanic *elkho(n)- (whence Old English colh).

It is not actually entirely clear which of these two is represented by modern English elk, which is first unequivocally recorded in the late 15th century. It is formally possible that it could be a survival of the Old English word, with its final /kh/ sound changed to /k/, but the long gap in the written record between Old English eolh and Middle English elk suggests that it could be an Old Norse borrowing.
=> eland
penyoudaoicibaDictYouDict
pen: English has three words pen. The oldest, ‘enclosure’ [OE], is something of a mystery term. It has no known relatives in the other European languages, and even in English it is not unequivocally found in its current sense until the 14th century. Pent [16], as in ‘pent up’, originated in the past participle of the verb pen. The earliest writing implements known as ‘pens’ were of course made from feathers, and so it is not surprising that the word pen [13] comes from a word that meant ‘feather’.

This was Latin penna, source also of English pennon [14] and a distant relative of English feather. It entered English via Old French penne. Pen ‘female swan’ [16] is of unknown origin.
=> pent; feather, pennon
unequivocal (adj.)youdaoicibaDictYouDict
1784, from un- (1) "not" + equivocal. Related: Unequivocally.