Learner's definition of YET
1
a : until now : so far至此；到现在为止 -
It's been the hardest year yet for our business. [=this is the hardest year our business has ever had]对我们公司来说，这是迄今为止最艰难的一年。
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His latest novel is his best one yet.他最新创作的小说是他迄今为止写得最好的一部。
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They haven't done much yet. = (less commonly) They haven't yet done much.他们还没做多少。
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The team has not yet won a game. = The team has not won a game yet. = The team has yet to win a game.这支队尚未赢得一场比赛。
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I haven't read the book yet.我还没有读过这本书。
b : at this time : so soon as now现在；此刻 -
Has the mail arrived yet?邮件到了吗？
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Are we there yet?我们到了没有？
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It's not time to eat yet.还不到吃东西的时候。
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“Are you ready?” “No, not yet.”“准备好了吗？”“没有，还没好。”
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We don't yet know what their plans are.我们还不知道他们的计划。
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Hasn't she called yet?她还没有打电话吗？
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Their suggestions won't be implemented, at least not yet.他们的建议是不会实施的，至少现在还没有。
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We don't have a firm grasp of the situation yet.我们还没有牢牢地把控局势。
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Has he left yet? = (US, informal) Did he leave yet?他走了没有？
2
a : in addition又；再 —
used for emphasis用于强调 b : to a greater extent or degree甚至；越发 3
: at a later time过些时候；过一会儿 4
—
used to indicate how long something will last用于表示某事物将持续的时间 -
A nasty cold will probably keep him out of the office for a few days yet. [=he will probably be out of the office for a few more days]他患了重感冒，可能还得过几天才能来上班。
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It may be some time yet before she's ready to date again.也许要再过相当长一段时间她才愿意重新开始约会吧。
as yet
also as of yet
: until the present time : so far到现在为止；至此
the best is yet to come/be
— see 3best
yet again
: for another time : again又；再一次 2 yet /ˈjɛt/ conjunction
Learner's definition of YET
—
used to introduce a statement that adds something to a previous statement and usually contrasts with it in some way然而；但是 -
We thought the idea sounded tempting, yet [=but] common sense told us it wouldn't work.我们认为这主意听起来很吸引人，但是常识告诉我们它行不通。
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She designs simple yet [=but] elegant clothing.她设计简洁却优雅的服装。
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She played well, yet she didn't qualify for the finals. [=although she played well, she didn't qualify for the finals]她表现得不错，但是没能获得决赛资格。
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Everyone seemed pleased, and yet I had the feeling that something was wrong.每个人似乎都很高兴，然而我却觉得有点儿不对劲儿。