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N-COUNT
(尤指固定地毯的)大頭釘，平頭釘
A tack is a short nail with a broad, flat head, especially one that is used for fastening carpets to the floor.
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VERB
用大頭釘(或圖釘)固定
If you tack something to a surface, you pin it there with tacks or drawing pins.
例句
He had tacked this note to her door...
他用圖釘將這張便條釘在她的門上。
She had recently taken a canvas from the theater and tacked it up on the wall.
她最近從劇院拿回一幅油畫，用圖釘把它釘在了墻上。
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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.
例句
In desperation I changed tack...
我走投無路，于是改變了策略。
This report takes a different tack from the 20 that have come before.
這份報告和此前的 20 份報告采取的思路不同。
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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.
例句
We were tacking fairly close inshore...
我們沿著近海岸曲折航行。
Our last trip involved a coastal passage, tacking east against wind and current...
我們上次旅行時曾經沿著海岸，逆著風浪向東曲折航行。
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VERB
（用大針腳）粗縫，暫時縫上
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.
例句
Tack them together with a 1.5 cm seam...
用 1.5 厘米的針腳將它們暫時縫上。
Tack the cord around the cushion.
用粗線沿著墊子邊繃一圈。