direction
1.in...direction是“向着…的方向”，from...direction是“从…的方向”。in...direction里的in不可改作to。
2.an easterly direction里用an，不用the，但the direction of the east里用the，不用an。
3.说“命令”、“吩咐”、“指示”、“（药的）服法”、“（器具的）用法”等都习惯用复数形式。后面有时接以that引导的从句，那从句里用should。例如：Before he started, he left directions that his papers should be kept where they were.
