If you're tired, caffeine can be helpful in low doses. 如果累了,小剂量的咖啡因会有帮助的。
It's helpful to have a calculator for this exam. 这次考试有个计算器很有用。
Exercise is helpful for controlling high blood pressure. 锻炼有助于控制高血压。
It would be helpful for me to meet him personally. 亲自去见他对我会有所帮助。
a traditional hotel with very helpful staff 服务人员非常乐于帮忙的传统旅馆
You've been most helpful. 你太帮忙了。
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