trillion
number /ˈtrɪljən/
/ˈtrɪljən/
You say a, one, two, several, etc. trillion without a final ‘s’ on ‘trillion’. Trillions (of…) can be used if there is no number or quantity before it. Always use a plural verb with trillion or trillions.万亿;兆 - a trillion, trillions (of…)(informal) a very large amount
There are more examples of how to use numbers at the entry for hundred.大量;无数 - (old-fashioned, British English) one million million million; 1 000 000 000 000 000 000
百万兆
词源late 17th cent.: from French, from million, by substitution of the prefix tri- ‘three’ for the initial letters.