But the key here is no leakage.

但是，这的关键就是没有泄露。

youdao

And that assumes obviously no leakage.

那明显是假设没有泄露的。

youdao

Elastic sealing, no leakage and long service life.

弹性密封，零泄漏，使用寿命长。

youdao

Infrared cameras on a boat accompanying the rig as it was being towed detected no signs of leakage early Monday, according to the unified incident response command, which includes the Coast Guard, Alaska's state environmental conservation department, a drilling company and Kodiak Island officials.

CNN: Alaska drilling rig towed to harbor off Kodiak Island

In order to do this the company needs to hermetically seal the drives to prevent He gas leakage over the life of the drive no mean feat.

FORBES: Rare Gases and Fine Lines