"leeching" in Chinese (Simplified)
吸取（比喻，指榨取资源）- 寄生
Definition
Leeching 指的是像水蛭吸血一样吸取他人的资源、精力或利益而不给予回报，通常用作比喻。
Usage Notes (Chinese (Simplified))
多用于口语和比喻，带有负面含义，常指某人不公平地从他人获益（如 'leeching off parents'）。在网络上也常用来指只下载不上传（比如种子下载）。不要与 'mooching'（要钱或要食物）混淆。
Examples
He was leeching money from his friends without giving anything back.
他在**吸取**朋友们的钱，但什么都没有回报。
The program was leeching all the computer's memory.
这个程序正在**占用**所有的电脑内存。
She is tired of her roommate leeching off her food.
她受够了室友总是**蹭**她的食物。
People get annoyed when others keep leeching off public Wi-Fi without permission.
当有人不停地**蹭用**公共Wi-Fi（没经过同意）时，大家都会觉得不爽。
He lost friends because he was always leeching off them, never offering to pay or help.
他总是**占便宜**，从不主动付钱或帮忙，结果朋友们都离他而去。
Some users just keep leeching files from the group and never upload anything in return.
有些用户只会一直**下载**群组资源，从不回传。