Ⅰ. at hand“在手边;在附近;即将到来”如：
① When he writes, he always keeps a dictionary at hand. 他写东西时，手边总有一本字典。
② Spring is at hand. 春天就要来了。
Ⅱ. in hand “在手中的;现有的”引申为：“在掌握中;在处理中”。如：
① I have 100 yuan in hand. 我手头有100元钱。
② The police immediately had the situation in hand. 警方立即控制了局势。