Definition: to close a letter or parcel by sticking the edges together Level: C2
邮寄前请密封信封。
Please ___seal the envelope before mailing it.
我的女朋友珍妮告诉我，她用颤抖的手指密封了信封，然后寄了出去。
Jenny, my girlfriend, told me that she ___sealed the envelope with trembling fingers and then posted it.
他用胶带密封了包裹。
He ___sealed the parcel with tape.
