Users therefore can search by title, by author, by subject, and often by keyword.
所以用户们可以根据标题、作者、主题，经常是关键字来搜索。
When the button state is changed (often by being pushed), the event will be generated.
当按钮状态发生改变时(通常是按钮被按下)，就会生成事件。
God guides us, often by circumstances.
上帝常常藉环境引导我们。
A large estate or farm on which crops are raised, often by resident workers.
种植庄稼的大型种植园或农场，经常由居住的工人种植。
And watch the Boston Symphony Orchestra perform as often as possible, often by myself.
一个人观看波士顿交响乐团的演出。
And watch the Boston Symphony Orchestra perform as often as possible, often by myself.
一个人观看波士顿交响乐团的演出。
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