to cross one's t's (and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly" is recorded from 1690s, though the exact signification remains uncertain despite much speculation. The measuring tool called a T-square (sometimes suggested as the source of this) is recorded by that name only from 1785. The T-cell (1970) so called because they are derived from the thymus. As a medieval numeral, T represented 160.
實(shí)用例句
1. T-shirts are a nice little earner and it's better than the dole.
賣T恤衫來(lái)錢容易，比領(lǐng)救濟(jì)金好。
來(lái)自柯林斯例句
2. T-shirts now seem almost de rigueur in the West End.
T恤衫現(xiàn)在幾乎成了倫敦西區(qū)時(shí)尚人士的必備之物。
來(lái)自柯林斯例句
3. He had bare feet, a T-shirt and cords on.
他光著腳，穿著T恤衫和燈芯絨褲子。
來(lái)自柯林斯例句
4. T-shirts, the epitome of American casualness, have moved upscale.
