This is not currently possible with the "Collapse All" function. However inner-level folds are preserved when they have manually been collapsed within an outer-level fold.

在展开“折叠全部”被折叠以后的外部文件夹，内在文件夹能保持折叠吗？

youdao

The detection limitation of PKS using antibodies was 1000 fold higher than Commassie blue staining, ready for detection of the probably very low level of PKS expression in plant.

利用抗体检测pks的检出极限比考马斯亮蓝染色高1000倍，应可用于检测植物中低水平的PKS表达。

youdao

Their interior planning is experimental, with apartments ranging from neat one-bedders with fold-out beds to split-level apartments.

其室内规划是实验性的，从整洁的单床配备折叠床到分层公寓。

youdao

Perhaps someday his royalty check would rise to reach the previous level, but that assumes five-fold growth in listener hours at Pandora or similar services.

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Its private gold demand has risen so much faster that imports through Hong Kong alone leapt above that level last year, rising three-fold from 2010 to total 428 tonnes.

FORBES: China's Gold Imports: Grain Of Salt, Please

They show for all the banks a combined net profit of JPY 1.76 trillion, a 2.2 fold increase over the previous year, the highest level in four years.

FORBES: Financial Performance of Six Big Banks