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a useless or worthless byproduct是什么意思？

a useless or worthless byproduct

无用或无价值之副产品

相关词汇
useless or worthless byproduct

useless

adj. 无用的，无效的，无价值的，差劲的，不怎么样的；
例句
The camel's feet, well adapted for dry sand, are useless on mud.
骆驼的蹄子虽然非常适合于在干沙上行走，碰到泥泞时却无计可施。

or

conj. 或，或者，还是，不然，否则，左右；prep. <古、诗>在…之前，比…更早；n. [纹章]黑金色、黑色；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

worthless

adj. 无价值的，不值钱的，卑微的，不足取的，不足道的，不足轻重；
例句
The guarantee could be worthless if the firm goes out of business...
如果厂家倒闭，保修单就会变得毫无用处。

byproduct

n. 副产品，意外结果，副作用；
例句
Sugar and its byproduct are the basis of the island's economy.
糖及其副产品是这个岛国经济的基础.
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
The patient's high fever deleted most of his memories.
病人的高烧使他的记忆丧失殆尽。
The roads were cordoned off.
这些道路被封锁了。
I sent the letter, but kept a copy for my files.
我寄了信, 但留了份影印本存档。
She foreboded her failure in the exam.
她预感自己会考试不及格。
They all thought of her as a nice girl.
他们都认为她是一个好女孩。
She snuggled up to him on the sofa.
她依偎着他坐在沙发上。
This screwdriver has been magnetised.
这把改锥已经磁化了。
Poor economic policies led to a long period of stagnation and decline.
糟糕的经济政策道致了长时间的经济萧条和下滑。
France is far from China.
法国离中国很远。
They don't think they must keep up with their neighbors.
他们认为不必和邻居比排场。