If you push too hard the bristles bend and are not effective.
如果你按压太用力，刷毛弯曲，就没效果了。
Hard as steel is, it will bend or break under the action of a strong force.
钢虽硬，但在强力作用下也会弯曲或断裂。
You will find it hard to bend.
你会发现很难弯曲。
It's hard to bend an iron bar.
把铁棒弄弯很不轻易。
It's hard to bend an iron bar.
把铁棒弄弯很不轻易。
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