[Python] preserve backslash of multiple line string when using ruamel-yaml

In newest version of ruamel-yaml 0.18.10 . If i want to preserve backslash of multiple line string. How should i do.

I use code like below.

import pathlib
from ruamel.yaml import YAML

control_file = 'xx/nist_ocp4.yml'

yaml = YAML()
yaml.preserve_quotes = True
d = yaml.load(pathlib.Path(control_file))
yaml.dump(d, pathlib.Path(control_file))


Before running code:

controls:
- id: AC-1
status: not applicable
description: "The organization:\n a. Develops, documents, and disseminates to [Assignment:\
\ or whenever a significant change occurs]"


After running code:

controls:
- id: AC-1
status: not applicable
description: "The organization:\n a. Develops, documents, and disseminates to [Assignment:
or whenever a significant change occurs]"

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