负性传导药物往往无效，心衰患者对这类药物的耐受性往往较差。
Negative dromotropic drugs are not always effective and may not be well tolerated in heart failure patients.
尽管科学家在将信息传递给记者、最终把信息传递给公众方面发挥了一定作用，但人们往往还是将无效沟通归咎于记者。
Even though scientists play a part in transmitting information to journalists and ultimately the public, too often the blame for ineffective communication is placed on the side of the journalists.
从近处看时，自由市场和自由社会往往是紊乱跟无效率的。
Free markets and free societies always look messy and inefficient, especially up close.
这种手术成功率高，但需要开胸操作，所以往往只适合于那些其他治疗无效的患者。
The procedure has a high success rate, but because it requires open-heart surgery, it's usually reserved for people who don't respond to other treatments.
但是目前低钠血症的治疗方法往往是无效的、不易耐受的。
Yet current therapies for hyponatremia are often ineffective and poorly tolerated.
如果工作共担这种安排无效，往往是因为只顾到时间的配合而忽视了其他，或者是因为某个雇员准备离职，公司匆忙把别的雇员凑在一块工作而导致的。
When job-sharing arrangements don't work out, it is often because the situation was constructed around scheduling or the job share was put together in haste because someone was going to leave.
即使在日常的生活中你也往往能感受到言辞的无助和无效。
成本分担博弈中的平均分担机制往往导致参与人低报自己的收益率，从而导致博弈结果的无效率。
The average sharing mechanism in cost sharing game often leads to participants' reporting a yield lower than the fact, thus an ineffectiveness of the game results.
针灸最常见的用途是慢性疼痛如关节炎、腰部疼痛、以及疲劳、焦虑和消化等问题，往往在使用传统医药无效。
The most common uses are for chronic pain conditions like arthritis, lower back pain and headaches, as well as fatigue, anxiety and digestive problems, often when conventional medicine fails.
总体来说，当衡量的质量最精确时，测试是最有效的；然而，当无法定义衡量或测试的内容时，测试往往是无效的。
In general, the tests work most effectively when the qualities to be measured can be most precisely defined and least effective when what is to be measured or predicted can not be well defined.
总体来说，当衡量的质量最精确时，测试是最有效的；然而，当无法定义衡量或测试的内容时，测试往往是无效的。
In general, the tests work most effectively when the qualities to be measured can be most precisely defined and least effective when what is to be measured or predicted can not be well defined.
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