Retention aid
[化] 助留剂
🧩 词语组成解析
retention
[ri'tenʃən]
n. 保留;记忆力，保持力;滞留，扣留;闭尿;
aid
[eid]
n. 帮助;助手;外援;辅助设备;
vt. 帮助;资助;救助;促进;
vi. 帮助;
🗣️ 情景例句
In addition, it's great exercise too, since we do a lot of hiking.
还有，那也是个好的运动，因为我们要长距离徒步旅行。
To be killed
被杀
She was totally exhausted.
她累垮了。