自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
N-COUNT (尤指固定地毯的)大头钉，平头钉 A tack is a short nail with a broad, flat head, especially one that is used for fastening carpets to the floor.
VERB 用大头钉(或图钉)固定 If you tack something to a surface, you pin it there with tacks or drawing pins.
He had tacked this note to her door...
She had recently taken a canvas from the theater and tacked it up on the wall.
N-SING 方法;策略;思路 If you change tack or try a different tack, you try a different method for dealing with a situation.
In desperation I changed tack...
This report takes a different tack from the 20 that have come before.
这份报告和此前的 20 份报告采取的思路不同。
V-ERG (使)(船只)曲折航行，蜿蜒航行 If a sailing boat is tacking or if the people in it tack it, it is sailing towards a particular point in a series of sideways movements rather than in a straight line.
We were tacking fairly close inshore...
Our last trip involved a coastal passage, tacking east against wind and current...
VERB （用大针脚）粗缝，暂时缝上 If you tack pieces of material together, you sew them together with big, loose stitches in order to hold them firmly or check that they fit, before sewing them properly.
Tack them together with a 1.5 cm seam...
用 1.5 厘米的针脚将它们暂时缝上。
Tack the cord around the cushion.