filament sag

例句：

1. 1. The fibers in the fabric are so fine that they can easily be pulled apart.
   这件织物的纤维非常细，很容易就被扯断了。
2. 2.The filament is so thin that it can barely hold its shape.
   这条纤维太薄了，几乎无法保持形状。
3. 3. The filament sag is a common problem with new electronic devices.
   细丝下垂是新电子设备常见的问题。