It's very difficult to demote somebody who has been filling in during maternity leave.
给替代歇产假的人降职是很难的。
Upside down, water filling her sinuses, it was difficult to remember how to escape.
她头朝下，水流进了鼻窦，这时候很难想起如何逃生。
Because of their bulk these filling cabinets are very difficult to move.
这些文件柜形体巨大，要移动十分困难。
Because of their bulk these filling cabinets are very difficult to move.
这些文件柜形体巨大，要移动十分困难。
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