采用了稳定耐用的热熔接方式来熔合封口，使封口更加密合。
With a stable and durable way to fusion weld heat sealed together to make sealing more encryption.
他交给她四封信。三封没封口，是老朋友寄来的生日卡。第四封是封口的，上面的字迹出自于迈拉之手。失望的痛楚攫住了老太太的心头。
He gave her four envelopes. Three were unsealed CARDS from old friends. The fourth was sealed, in Myra's writing. The old lady felt a pang of disappointment.
用刀直接截取密封口，用锯子或剪刀把封口附近的材料给去掉。
Cut directly across seal or closure with knife, saw, or scissors and remove section containing adjacent material.
应用推荐