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並前往https://www.cs.brandeis.edu/~cs146a/rust/doc-02-21-2015/core/cell/struct.RefCell.html

core::cell::RefCell - Rust

[-] fn try_borrow<'a>(&'a self) -> Option<Ref<'a, T>>. Attempts to immutably borrow the wrapped value. The borrow lasts until the returned Ref exits scope.

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