A metal protective shell is required to externally keep the material dry. In context, I will explain the following key vocabulary to you:

LNG → Liquefied Natural Gas: The abbreviation for liquefied natural gas, which refers to the liquid form of natural gas after low-temperature treatment, making it easy to store and transport.

Elastic felt: A felt like material with elasticity that maintains stable flexibility and thermal insulation properties in low-temperature environments, commonly used in low-temperature engineering.

Thermal insulation properties refer to the ability of materials to prevent heat transfer, which is particularly important in low-temperature engineering to ensure system stability and efficiency.

Resistance to low temperatures without cracking: This is an important performance indicator for low-temperature engineering materials, which describes the characteristic that materials will not break due to cold shrinkage in low-temperature environments.

Cold loss: In low-temperature systems, heat loss caused by poor insulation or environmental factors leads to a decrease in system efficiency or energy waste.

Misalignment laying → laid in a staged manner: Refers to laying materials in a staggered manner between multiple layers to enhance the stability and insulation effect of the overall structure.

The above are the key vocabulary of AI translation results: elastic felt, resilient felt, thermal insulation performance, heat insulating property, low-temperature engineering, cryogenics engineering, long-term stability structure, stable structure, conveying pipeline, equipment connection, device connection, device connection, multi-layer stacking, misplacement, misplacement, dislocation, version metal protection