词汇与表达：balk-bald-prevent-hinder-convenient

balk
畏缩不前; 妨碍; 防止; 使受挫折; （突然）停止; 犹豫; 回避
Not fair, I'd balk silently as she and I walked.
不公平。她和我散步时,我沉默了，畏缩不前。
prevent
They took active steps to prevent the spread of the disease.
他们采取积极措施，防止疾病蔓延。
记忆技巧：pre 预先 + vent 来 → 预先来到 → 抢先一步，防止别人先到 → 防止

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vent词根参考：http://www.etthink.com/thread-284423-1-1.html
hinder
Landslides and bad weather are continuing to hinder the arrival of relief supplies to the area.
滑坡和恶劣天气仍在阻碍救援物资运送到该地区。

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