B1 [ I or T ] to (cause something to) become firmly fixed together, or in position, or closed扣紧;系牢;扎好;关紧
B2 to fix one thing to another把…固定在(…上)/在一起(等等)
More examples
Are the children safely fastened into their car seats?
She fastened her belt tightly around her waist.
The door was securely fastened.
To keep the helmet in position, fasten the strap beneath the chin.
Could you help me fasten this strap around my suitcase?
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