on hand;at hand ;

You may want to keep this brochure safe, so you have it to hand whenever you may need it.
你应该保管好这份手册,这样随时想用都能马上在手边找到。
来源:《柯林斯高阶英汉双解学习词典》Keep the dictionary at your elbow so you can use it for reference anytime.
把这本字典留在你手边,以便随时可以参考.
来源:《简明英汉词典》However, few people keep cell-culture medium handy at home or in school.
然而, 在家里或学校里很少人手边有细胞培养液.
来源:英语晨读30分(高三)
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